diff --git a/src/main/java/controlP5/layout/ControllerFactory.java b/src/main/java/controlP5/layout/ControllerFactory.java
new file mode 100644
index 0000000..deb6f1e
--- /dev/null
+++ b/src/main/java/controlP5/layout/ControllerFactory.java
@@ -0,0 +1,133 @@
+package controlP5.layout;
+
+import controlP5.*;
+import controlP5.layout.lang.XMLParser;
+import processing.core.PApplet;
+
+import java.lang.reflect.Constructor;
+import java.util.*;
+import java.lang.reflect.*;
+
+public class ControllerFactory {
+    private final PApplet applet;
+    private final ControlP5 cp5;
+    private final Map<String, Class<? extends Controller>> controlMap;
+
+
+    public ControllerFactory(PApplet applet, ControlP5 cp5) {
+        this.applet = applet;
+        this.cp5 = cp5;
+
+
+        controlMap = new HashMap<>();
+//        controlMap.put("Accordion", Accordion.class);
+//        controlMap.put("Background", Background.class);
+//        controlMap.put("Canvas", Canvas.class);
+//        controlMap.put("ChartData", ChartData.class);
+//        controlMap.put("ChartDataSet", ChartDataSet.class);
+//        controlMap.put("CheckBox", CheckBox.class);
+//        controlMap.put("ColorPicker", ColorPicker.class);
+//        controlMap.put("Group", Group.class);
+//        controlMap.put("Label", Label.class);
+//        controlMap.put("RadioButton", RadioButton.class);
+//        controlMap.put("Textarea", Textarea.class);
+//        controlMap.put("TickMark", TickMark.class);
+//        controlMap.put("Tooltip", Tooltip.class);
+        controlMap.put("Bang", Bang.class);
+        controlMap.put("Button", Button.class);
+        controlMap.put("ButtonBar", ButtonBar.class);
+        controlMap.put("Chart", Chart.class);
+        controlMap.put("ColorWheel", ColorWheel.class);
+        controlMap.put("Icon", Icon.class);
+        controlMap.put("Knob", Knob.class);
+        controlMap.put("ListBox", ListBox.class);
+        controlMap.put("Matrix", Matrix.class);
+        controlMap.put("MultiList", MultiList.class);
+        controlMap.put("MultilineTextfield", MultilineTextfield.class);
+        controlMap.put("Numberbox", Numberbox.class);
+        controlMap.put("Range", Range.class);
+        controlMap.put("ScrollableList", ScrollableList.class);
+        controlMap.put("Slider", Slider.class);
+        controlMap.put("Slider2D", Slider2D.class);
+        controlMap.put("Spacer", Spacer.class);
+        controlMap.put("Textfield", Textfield.class);
+        controlMap.put("Textlabel", Textlabel.class);
+        controlMap.put("Toggle", Toggle.class);
+
+    }
+
+    /* creates  a controller based on the controlName */
+    public Controller<?> createController(String controlName) {
+        Class<? extends Controller> controllerClass = controlMap.get(controlName);
+        if (controllerClass == null) {
+            throw new IllegalArgumentException("Invalid control name: " + controlName);
+        }
+
+        try {
+            //instantiate the controller
+            Constructor<? extends Controller> constructor = controllerClass.getConstructor(ControlP5.class,String.class);
+            return constructor.newInstance(cp5,"");
+        } catch (Exception e) {
+            throw new RuntimeException("Failed to create control: " + controlName, e);
+        }
+    }
+
+    public Group createGroup(String groupName) {
+        return new Group(cp5, groupName);
+    };
+
+    public void configure(Controller<?> controller, String attrName, XMLParser.ValueContext attrValueContext) {
+        // eg. turn things like '23px' or '35%' into pixels value
+        int attrValue = getValue(attrValueContext);
+
+        switch (attrName) {
+            case "x":
+                controller.setPosition(attrValue, controller.getPosition()[1]);
+                break;
+            case "y":
+                controller.setPosition(controller.getPosition()[0], attrValue);
+                break;
+            case "width":
+                controller.setWidth(attrValue);
+                break;
+            case "height":
+                controller.setHeight(attrValue);
+                break;
+            case "color":
+                // Assuming color value is given as a hex string
+                break;
+//            case "label":
+//                controller.setLabel(attrValue);
+//                break;
+//            case "visible":
+//                controller.setVisible(Boolean.parseBoolean(attrValue));
+//                break;
+//            case "captionLabel":
+//                controller.getCaptionLabel().setText(attrValue);
+//                break;
+//            case "valueLabel":
+//                controller.getValueLabel().setText(attrValue);
+//                break;
+            default:
+                System.out.println("Unknown attribute: " + attrName);
+        }
+    }
+
+    private int getValue(XMLParser.ValueContext ctx) {
+        String unit = ctx.UNIT().getText();
+        String value = ctx.NUMBER().getText();
+
+        switch (unit) {
+            case "px":
+                return Integer.parseInt(value);
+            case "%":
+                //get tabs
+                ControllerList _myTabs = cp5.getWindow().getTabs();
+
+                return (int) (Float.parseFloat(value) / 100.0f * _myTabs.get(0).getWidth());
+
+            default:
+                throw new IllegalArgumentException("Unknown unit: " + unit);
+        }
+    }
+}
diff --git a/src/main/java/controlP5/layout/LayoutBuilder.java b/src/main/java/controlP5/layout/LayoutBuilder.java
index f450a2e..ae53c30 100644
--- a/src/main/java/controlP5/layout/LayoutBuilder.java
+++ b/src/main/java/controlP5/layout/LayoutBuilder.java
@@ -1,43 +1,165 @@
 package controlP5.layout;
 
-import controlP5.layout.lang.XMLBaseListener;
+
+import controlP5.ControlP5;
+import controlP5.layout.lang.XMLBaseVisitor;
 import controlP5.layout.lang.XMLLexer;
 import controlP5.layout.lang.XMLParser;
 import org.antlr.v4.runtime.*;
 import org.antlr.v4.runtime.tree.*;
+import org.antlr.v4.runtime.tree.ParseTreeWalker;
+import processing.core.PApplet;
+import java.util.ArrayDeque;
+import java.util.Deque;
+import java.util.HashMap;
+
 
 public class LayoutBuilder {
+    private final ControlP5 _cp5;
+    private final PApplet _pApplet;
+    private final Deque<ElementProps> contextStack = new ArrayDeque<>();
 
-    public static void parseXML(String xml) throws Exception {
+    public LayoutBuilder(PApplet pApplet, ControlP5 cp5) {
+        _cp5 = cp5;
+        _pApplet = pApplet;
+
+
+    }
+
+    public void parseXML(String xml) throws Exception {
         ANTLRInputStream input = new ANTLRInputStream(xml);
         XMLLexer lexer = new XMLLexer(input);
         CommonTokenStream tokens = new CommonTokenStream(lexer);
         XMLParser parser = new XMLParser(tokens);
         ParseTree tree = parser.document();
 
+        //create walker
         ParseTreeWalker walker = new ParseTreeWalker();
-        XMLListener listener = new XMLListener();
-        walker.walk(listener, tree);
+        XMLVisitor visitor = new XMLVisitor(_pApplet, _cp5);
+        visitor.visit(tree);
+
+
     }
 
-    private static class XMLListener extends XMLBaseListener {
+    private class XMLVisitor extends XMLBaseVisitor {
+
+        private final ControlP5 _cp5;
+        private final PApplet _pApplet;
+
+        public XMLVisitor(PApplet pApplet, ControlP5 cp5) {
+            _cp5 = cp5;
+            _pApplet = pApplet;
+        }
+
+
+    //visit first node
         @Override
-        public void enterStartTag(XMLParser.StartTagContext ctx) {
-            String controlName = ctx.Name().getText();
+        public Object visitDocument(XMLParser.DocumentContext ctx) {
+            // get width and height from the papplet
+            int parentWidth = _pApplet.width;
+            int parentHeight = _pApplet.height;
 
-            // Create ControlP5 instance based on controlName
-            // ControlP5 control = ControlP5Factory.create(controlName);
 
-            int attrCount = ctx.attribute().size();
-            for(int i = 0; i < attrCount; i++) {
-                String attrName = ctx.attribute(i).Name().getText();
-                String attrValue = ctx.attribute(i).STRING().getText();
-
-                // Set attribute
-                // control.setAttribute(attrName, attrValue);
+            //visit children
+            for (int i = 0; i < ctx.children.size(); i++) {
+                contextStack.push(new ElementProps(parentWidth, parentHeight));
+                visit(ctx.children.get(i));
+                contextStack.pop();
             }
 
-            // After setting all attributes, you could add the control to your UI or store it somewhere
+            return null;
+
+        }
+
+        @Override
+        public Object visitElement(XMLParser.ElementContext ctx) {
+            //parent props
+            ElementProps parentProps = contextStack.peek();
+            Tag tag = (Tag) visitStartTag(ctx.startTag());
+            System.out.println("im a " + tag.getName() + " and my parent has " + parentProps.width + " " + parentProps.height);
+
+
+
+            //visit children
+            for (int i = 0; i < ctx.children.size(); i++) {
+                contextStack.push(new ElementProps(parentProps.width/2, parentProps.height/2));
+                visit(ctx.children.get(i));
+                contextStack.pop();
+            }
+
+
+            return null;
+        }
+
+        @Override
+        public Object visitStartTag(XMLParser.StartTagContext ctx) {
+            HashMap<String,Attribute<?>>  attributes = new HashMap<>();
+            for (int i = 0; i < ctx.attribute().size() ; i++) {
+                Attribute<?> attribute = (Attribute<?>) visitAttribute(ctx.attribute(i));
+                attributes.put(attribute.getName(), attribute);
+            }
+
+            Tag tag = new Tag(ctx.Name().getText(), attributes);
+            return tag;
+        }
+
+        @Override
+        public Object visitAttribute(XMLParser.AttributeContext ctx) {
+            if(ctx.value().STRING() != null){
+                String name = ctx.Name().getText();
+                String value = ctx.value().STRING().getText();
+                return new Attribute<String>(name, value);
+            }else if(ctx.value().NUMBER() != null) {
+                String name = ctx.Name().getText();
+                int value = Integer.parseInt(ctx.value().NUMBER().getText());
+
+                return new Attribute<Integer>(name, value);
+            }
+            return null;
+        }
+
+
+    }
+
+    private class ElementProps {
+        int width;
+        int height;
+
+        public ElementProps(int width, int height) {
+            this.width = width;
+            this.height = height;
+        }
+    }
+
+    private class Tag {
+        private String name;
+        private HashMap<String,Attribute<?>>  attributes;
+
+        public Tag(String name, HashMap<String,Attribute<?>> attributes) {
+            this.name = name;
+            this.attributes = attributes;
+        }
+        public String getName() {
+            return name;
+        }
+        public HashMap<String,Attribute<?>>  getAttributes() {
+            return attributes;
+        }
+    }
+
+    private class Attribute<T> {
+        private String name;
+        private T value;
+
+        public Attribute(String name, T value) {
+            this.name = name;
+            this.value = value;
+        }
+        public String getName() {
+            return name;
+        }
+        public T getValue() {
+            return value;
         }
     }
 }
diff --git a/src/main/java/controlP5/layout/XML.g4 b/src/main/java/controlP5/layout/XML.g4
index b26517e..08e98a6 100644
--- a/src/main/java/controlP5/layout/XML.g4
+++ b/src/main/java/controlP5/layout/XML.g4
@@ -1,23 +1,26 @@
 grammar XML;
 
-document  : element EOF ;
+document  : '<Window>' element+ '</Window>' ;
 
-element   : startTag (content | SPACE)* endTag
+element   : startTag (content )? endTag
           | SELF_CLOSING
           ;
 
-startTag  : OPEN Name attribute* CLOSE ;
+startTag  : OPEN Name  attribute* CLOSE ;
 
 endTag    : OPEN_SLASH Name CLOSE ;
 
 SELF_CLOSING : OPEN Name SLASH_CLOSE ;
 
-attribute : Name EQUALS STRING ;
+attribute : Name EQUALS value ;
 
 content   : element | STRING ;
 
+value: STRING
+     | NUMBER UNIT;
 
-SPACE     : [ \t\r\n] ;
+UNIT: 'px' | '%';
+WS : [ \t\r\n]+ -> skip;
 OPEN      : '<' ;
 OPEN_SLASH: '</' ;
 CLOSE     : '>' ;
@@ -26,6 +29,7 @@ EQUALS    : '=' ;
 
 Name      : ALPHA (ALPHA | DIGIT | '.' | '-' | '_')* ;
 STRING    : '"' ( ~'"' )* '"' | '\'' ( ~'\'' )* '\'' ;
+NUMBER : DIGIT+ ;
 
 fragment DIGIT : [0-9] ;
 fragment ALPHA : [a-zA-Z] ;
diff --git a/src/main/java/controlP5/layout/lang/XML.interp b/src/main/java/controlP5/layout/lang/XML.interp
index e4fb8d8..b98a8de 100644
--- a/src/main/java/controlP5/layout/lang/XML.interp
+++ b/src/main/java/controlP5/layout/lang/XML.interp
@@ -1,5 +1,8 @@
 token literal names:
 null
+'<Window>'
+'</Window>'
+null
 null
 null
 '<'
@@ -9,11 +12,15 @@ null
 '='
 null
 null
+null
 
 token symbolic names:
 null
+null
+null
 SELF_CLOSING
-SPACE
+UNIT
+WS
 OPEN
 OPEN_SLASH
 CLOSE
@@ -21,6 +28,7 @@ SLASH_CLOSE
 EQUALS
 Name
 STRING
+NUMBER
 
 rule names:
 document
@@ -29,7 +37,8 @@ startTag
 endTag
 attribute
 content
+value
 
 
 atn:
-[4, 1, 9, 51, 2, 0, 7, 0, 2, 1, 7, 1, 2, 2, 7, 2, 2, 3, 7, 3, 2, 4, 7, 4, 2, 5, 7, 5, 1, 0, 1, 0, 1, 0, 1, 1, 1, 1, 1, 1, 5, 1, 19, 8, 1, 10, 1, 12, 1, 22, 9, 1, 1, 1, 1, 1, 1, 1, 3, 1, 27, 8, 1, 1, 2, 1, 2, 1, 2, 5, 2, 32, 8, 2, 10, 2, 12, 2, 35, 9, 2, 1, 2, 1, 2, 1, 3, 1, 3, 1, 3, 1, 3, 1, 4, 1, 4, 1, 4, 1, 4, 1, 5, 1, 5, 3, 5, 49, 8, 5, 1, 5, 0, 0, 6, 0, 2, 4, 6, 8, 10, 0, 0, 49, 0, 12, 1, 0, 0, 0, 2, 26, 1, 0, 0, 0, 4, 28, 1, 0, 0, 0, 6, 38, 1, 0, 0, 0, 8, 42, 1, 0, 0, 0, 10, 48, 1, 0, 0, 0, 12, 13, 3, 2, 1, 0, 13, 14, 5, 0, 0, 1, 14, 1, 1, 0, 0, 0, 15, 20, 3, 4, 2, 0, 16, 19, 3, 10, 5, 0, 17, 19, 5, 2, 0, 0, 18, 16, 1, 0, 0, 0, 18, 17, 1, 0, 0, 0, 19, 22, 1, 0, 0, 0, 20, 18, 1, 0, 0, 0, 20, 21, 1, 0, 0, 0, 21, 23, 1, 0, 0, 0, 22, 20, 1, 0, 0, 0, 23, 24, 3, 6, 3, 0, 24, 27, 1, 0, 0, 0, 25, 27, 5, 1, 0, 0, 26, 15, 1, 0, 0, 0, 26, 25, 1, 0, 0, 0, 27, 3, 1, 0, 0, 0, 28, 29, 5, 3, 0, 0, 29, 33, 5, 8, 0, 0, 30, 32, 3, 8, 4, 0, 31, 30, 1, 0, 0, 0, 32, 35, 1, 0, 0, 0, 33, 31, 1, 0, 0, 0, 33, 34, 1, 0, 0, 0, 34, 36, 1, 0, 0, 0, 35, 33, 1, 0, 0, 0, 36, 37, 5, 5, 0, 0, 37, 5, 1, 0, 0, 0, 38, 39, 5, 4, 0, 0, 39, 40, 5, 8, 0, 0, 40, 41, 5, 5, 0, 0, 41, 7, 1, 0, 0, 0, 42, 43, 5, 8, 0, 0, 43, 44, 5, 7, 0, 0, 44, 45, 5, 9, 0, 0, 45, 9, 1, 0, 0, 0, 46, 49, 3, 2, 1, 0, 47, 49, 5, 9, 0, 0, 48, 46, 1, 0, 0, 0, 48, 47, 1, 0, 0, 0, 49, 11, 1, 0, 0, 0, 5, 18, 20, 26, 33, 48]
\ No newline at end of file
+[4, 1, 13, 59, 2, 0, 7, 0, 2, 1, 7, 1, 2, 2, 7, 2, 2, 3, 7, 3, 2, 4, 7, 4, 2, 5, 7, 5, 2, 6, 7, 6, 1, 0, 1, 0, 4, 0, 17, 8, 0, 11, 0, 12, 0, 18, 1, 0, 1, 0, 1, 1, 1, 1, 3, 1, 25, 8, 1, 1, 1, 1, 1, 1, 1, 3, 1, 30, 8, 1, 1, 2, 1, 2, 1, 2, 5, 2, 35, 8, 2, 10, 2, 12, 2, 38, 9, 2, 1, 2, 1, 2, 1, 3, 1, 3, 1, 3, 1, 3, 1, 4, 1, 4, 1, 4, 1, 4, 1, 5, 1, 5, 3, 5, 52, 8, 5, 1, 6, 1, 6, 1, 6, 3, 6, 57, 8, 6, 1, 6, 0, 0, 7, 0, 2, 4, 6, 8, 10, 12, 0, 0, 57, 0, 14, 1, 0, 0, 0, 2, 29, 1, 0, 0, 0, 4, 31, 1, 0, 0, 0, 6, 41, 1, 0, 0, 0, 8, 45, 1, 0, 0, 0, 10, 51, 1, 0, 0, 0, 12, 56, 1, 0, 0, 0, 14, 16, 5, 1, 0, 0, 15, 17, 3, 2, 1, 0, 16, 15, 1, 0, 0, 0, 17, 18, 1, 0, 0, 0, 18, 16, 1, 0, 0, 0, 18, 19, 1, 0, 0, 0, 19, 20, 1, 0, 0, 0, 20, 21, 5, 2, 0, 0, 21, 1, 1, 0, 0, 0, 22, 24, 3, 4, 2, 0, 23, 25, 3, 10, 5, 0, 24, 23, 1, 0, 0, 0, 24, 25, 1, 0, 0, 0, 25, 26, 1, 0, 0, 0, 26, 27, 3, 6, 3, 0, 27, 30, 1, 0, 0, 0, 28, 30, 5, 3, 0, 0, 29, 22, 1, 0, 0, 0, 29, 28, 1, 0, 0, 0, 30, 3, 1, 0, 0, 0, 31, 32, 5, 6, 0, 0, 32, 36, 5, 11, 0, 0, 33, 35, 3, 8, 4, 0, 34, 33, 1, 0, 0, 0, 35, 38, 1, 0, 0, 0, 36, 34, 1, 0, 0, 0, 36, 37, 1, 0, 0, 0, 37, 39, 1, 0, 0, 0, 38, 36, 1, 0, 0, 0, 39, 40, 5, 8, 0, 0, 40, 5, 1, 0, 0, 0, 41, 42, 5, 7, 0, 0, 42, 43, 5, 11, 0, 0, 43, 44, 5, 8, 0, 0, 44, 7, 1, 0, 0, 0, 45, 46, 5, 11, 0, 0, 46, 47, 5, 10, 0, 0, 47, 48, 3, 12, 6, 0, 48, 9, 1, 0, 0, 0, 49, 52, 3, 2, 1, 0, 50, 52, 5, 12, 0, 0, 51, 49, 1, 0, 0, 0, 51, 50, 1, 0, 0, 0, 52, 11, 1, 0, 0, 0, 53, 57, 5, 12, 0, 0, 54, 55, 5, 13, 0, 0, 55, 57, 5, 4, 0, 0, 56, 53, 1, 0, 0, 0, 56, 54, 1, 0, 0, 0, 57, 13, 1, 0, 0, 0, 6, 18, 24, 29, 36, 51, 56]
\ No newline at end of file
diff --git a/src/main/java/controlP5/layout/lang/XML.tokens b/src/main/java/controlP5/layout/lang/XML.tokens
index f1d8167..30d639a 100644
--- a/src/main/java/controlP5/layout/lang/XML.tokens
+++ b/src/main/java/controlP5/layout/lang/XML.tokens
@@ -1,14 +1,20 @@
-SELF_CLOSING=1
-SPACE=2
-OPEN=3
-OPEN_SLASH=4
-CLOSE=5
-SLASH_CLOSE=6
-EQUALS=7
-Name=8
-STRING=9
-'<'=3
-'</'=4
-'>'=5
-'/>'=6
-'='=7
+T__0=1
+T__1=2
+SELF_CLOSING=3
+UNIT=4
+WS=5
+OPEN=6
+OPEN_SLASH=7
+CLOSE=8
+SLASH_CLOSE=9
+EQUALS=10
+Name=11
+STRING=12
+NUMBER=13
+'<Window>'=1
+'</Window>'=2
+'<'=6
+'</'=7
+'>'=8
+'/>'=9
+'='=10
diff --git a/src/main/java/controlP5/layout/lang/XMLBaseListener.java b/src/main/java/controlP5/layout/lang/XMLBaseListener.java
index 90a3ea5..00befed 100644
--- a/src/main/java/controlP5/layout/lang/XMLBaseListener.java
+++ b/src/main/java/controlP5/layout/lang/XMLBaseListener.java
@@ -84,6 +84,18 @@ public class XMLBaseListener implements XMLListener {
 	 * <p>The default implementation does nothing.</p>
 	 */
 	@Override public void exitContent(XMLParser.ContentContext ctx) { }
+	/**
+	 * {@inheritDoc}
+	 *
+	 * <p>The default implementation does nothing.</p>
+	 */
+	@Override public void enterValue(XMLParser.ValueContext ctx) { }
+	/**
+	 * {@inheritDoc}
+	 *
+	 * <p>The default implementation does nothing.</p>
+	 */
+	@Override public void exitValue(XMLParser.ValueContext ctx) { }
 
 	/**
 	 * {@inheritDoc}
diff --git a/src/main/java/controlP5/layout/lang/XMLBaseVisitor.java b/src/main/java/controlP5/layout/lang/XMLBaseVisitor.java
new file mode 100644
index 0000000..07fbb5b
--- /dev/null
+++ b/src/main/java/controlP5/layout/lang/XMLBaseVisitor.java
@@ -0,0 +1,64 @@
+// Generated from XML.g4 by ANTLR 4.13.0
+package controlP5.layout.lang;
+import org.antlr.v4.runtime.tree.AbstractParseTreeVisitor;
+
+/**
+ * This class provides an empty implementation of {@link XMLVisitor},
+ * which can be extended to create a visitor which only needs to handle a subset
+ * of the available methods.
+ *
+ * @param <T> The return type of the visit operation. Use {@link Void} for
+ * operations with no return type.
+ */
+@SuppressWarnings("CheckReturnValue")
+public class XMLBaseVisitor<T> extends AbstractParseTreeVisitor<T> implements XMLVisitor<T> {
+	/**
+	 * {@inheritDoc}
+	 *
+	 * <p>The default implementation returns the result of calling
+	 * {@link #visitChildren} on {@code ctx}.</p>
+	 */
+	@Override public T visitDocument(XMLParser.DocumentContext ctx) { return visitChildren(ctx); }
+	/**
+	 * {@inheritDoc}
+	 *
+	 * <p>The default implementation returns the result of calling
+	 * {@link #visitChildren} on {@code ctx}.</p>
+	 */
+	@Override public T visitElement(XMLParser.ElementContext ctx) { return visitChildren(ctx); }
+	/**
+	 * {@inheritDoc}
+	 *
+	 * <p>The default implementation returns the result of calling
+	 * {@link #visitChildren} on {@code ctx}.</p>
+	 */
+	@Override public T visitStartTag(XMLParser.StartTagContext ctx) { return visitChildren(ctx); }
+	/**
+	 * {@inheritDoc}
+	 *
+	 * <p>The default implementation returns the result of calling
+	 * {@link #visitChildren} on {@code ctx}.</p>
+	 */
+	@Override public T visitEndTag(XMLParser.EndTagContext ctx) { return visitChildren(ctx); }
+	/**
+	 * {@inheritDoc}
+	 *
+	 * <p>The default implementation returns the result of calling
+	 * {@link #visitChildren} on {@code ctx}.</p>
+	 */
+	@Override public T visitAttribute(XMLParser.AttributeContext ctx) { return visitChildren(ctx); }
+	/**
+	 * {@inheritDoc}
+	 *
+	 * <p>The default implementation returns the result of calling
+	 * {@link #visitChildren} on {@code ctx}.</p>
+	 */
+	@Override public T visitContent(XMLParser.ContentContext ctx) { return visitChildren(ctx); }
+	/**
+	 * {@inheritDoc}
+	 *
+	 * <p>The default implementation returns the result of calling
+	 * {@link #visitChildren} on {@code ctx}.</p>
+	 */
+	@Override public T visitValue(XMLParser.ValueContext ctx) { return visitChildren(ctx); }
+}
\ No newline at end of file
diff --git a/src/main/java/controlP5/layout/lang/XMLLexer.interp b/src/main/java/controlP5/layout/lang/XMLLexer.interp
index ed666d1..5848fd8 100644
--- a/src/main/java/controlP5/layout/lang/XMLLexer.interp
+++ b/src/main/java/controlP5/layout/lang/XMLLexer.interp
@@ -1,5 +1,8 @@
 token literal names:
 null
+'<Window>'
+'</Window>'
+null
 null
 null
 '<'
@@ -9,11 +12,15 @@ null
 '='
 null
 null
+null
 
 token symbolic names:
 null
+null
+null
 SELF_CLOSING
-SPACE
+UNIT
+WS
 OPEN
 OPEN_SLASH
 CLOSE
@@ -21,10 +28,14 @@ SLASH_CLOSE
 EQUALS
 Name
 STRING
+NUMBER
 
 rule names:
+T__0
+T__1
 SELF_CLOSING
-SPACE
+UNIT
+WS
 OPEN
 OPEN_SLASH
 CLOSE
@@ -32,6 +43,7 @@ SLASH_CLOSE
 EQUALS
 Name
 STRING
+NUMBER
 DIGIT
 ALPHA
 
@@ -43,4 +55,4 @@ mode names:
 DEFAULT_MODE
 
 atn:
-[4, 0, 9, 72, 6, -1, 2, 0, 7, 0, 2, 1, 7, 1, 2, 2, 7, 2, 2, 3, 7, 3, 2, 4, 7, 4, 2, 5, 7, 5, 2, 6, 7, 6, 2, 7, 7, 7, 2, 8, 7, 8, 2, 9, 7, 9, 2, 10, 7, 10, 1, 0, 1, 0, 1, 0, 1, 0, 1, 1, 1, 1, 1, 2, 1, 2, 1, 3, 1, 3, 1, 3, 1, 4, 1, 4, 1, 5, 1, 5, 1, 5, 1, 6, 1, 6, 1, 7, 1, 7, 1, 7, 1, 7, 5, 7, 46, 8, 7, 10, 7, 12, 7, 49, 9, 7, 1, 8, 1, 8, 5, 8, 53, 8, 8, 10, 8, 12, 8, 56, 9, 8, 1, 8, 1, 8, 1, 8, 5, 8, 61, 8, 8, 10, 8, 12, 8, 64, 9, 8, 1, 8, 3, 8, 67, 8, 8, 1, 9, 1, 9, 1, 10, 1, 10, 0, 0, 11, 1, 1, 3, 2, 5, 3, 7, 4, 9, 5, 11, 6, 13, 7, 15, 8, 17, 9, 19, 0, 21, 0, 1, 0, 6, 3, 0, 9, 10, 13, 13, 32, 32, 2, 0, 45, 46, 95, 95, 1, 0, 34, 34, 1, 0, 39, 39, 1, 0, 48, 57, 2, 0, 65, 90, 97, 122, 75, 0, 1, 1, 0, 0, 0, 0, 3, 1, 0, 0, 0, 0, 5, 1, 0, 0, 0, 0, 7, 1, 0, 0, 0, 0, 9, 1, 0, 0, 0, 0, 11, 1, 0, 0, 0, 0, 13, 1, 0, 0, 0, 0, 15, 1, 0, 0, 0, 0, 17, 1, 0, 0, 0, 1, 23, 1, 0, 0, 0, 3, 27, 1, 0, 0, 0, 5, 29, 1, 0, 0, 0, 7, 31, 1, 0, 0, 0, 9, 34, 1, 0, 0, 0, 11, 36, 1, 0, 0, 0, 13, 39, 1, 0, 0, 0, 15, 41, 1, 0, 0, 0, 17, 66, 1, 0, 0, 0, 19, 68, 1, 0, 0, 0, 21, 70, 1, 0, 0, 0, 23, 24, 3, 5, 2, 0, 24, 25, 3, 15, 7, 0, 25, 26, 3, 11, 5, 0, 26, 2, 1, 0, 0, 0, 27, 28, 7, 0, 0, 0, 28, 4, 1, 0, 0, 0, 29, 30, 5, 60, 0, 0, 30, 6, 1, 0, 0, 0, 31, 32, 5, 60, 0, 0, 32, 33, 5, 47, 0, 0, 33, 8, 1, 0, 0, 0, 34, 35, 5, 62, 0, 0, 35, 10, 1, 0, 0, 0, 36, 37, 5, 47, 0, 0, 37, 38, 5, 62, 0, 0, 38, 12, 1, 0, 0, 0, 39, 40, 5, 61, 0, 0, 40, 14, 1, 0, 0, 0, 41, 47, 3, 21, 10, 0, 42, 46, 3, 21, 10, 0, 43, 46, 3, 19, 9, 0, 44, 46, 7, 1, 0, 0, 45, 42, 1, 0, 0, 0, 45, 43, 1, 0, 0, 0, 45, 44, 1, 0, 0, 0, 46, 49, 1, 0, 0, 0, 47, 45, 1, 0, 0, 0, 47, 48, 1, 0, 0, 0, 48, 16, 1, 0, 0, 0, 49, 47, 1, 0, 0, 0, 50, 54, 5, 34, 0, 0, 51, 53, 8, 2, 0, 0, 52, 51, 1, 0, 0, 0, 53, 56, 1, 0, 0, 0, 54, 52, 1, 0, 0, 0, 54, 55, 1, 0, 0, 0, 55, 57, 1, 0, 0, 0, 56, 54, 1, 0, 0, 0, 57, 67, 5, 34, 0, 0, 58, 62, 5, 39, 0, 0, 59, 61, 8, 3, 0, 0, 60, 59, 1, 0, 0, 0, 61, 64, 1, 0, 0, 0, 62, 60, 1, 0, 0, 0, 62, 63, 1, 0, 0, 0, 63, 65, 1, 0, 0, 0, 64, 62, 1, 0, 0, 0, 65, 67, 5, 39, 0, 0, 66, 50, 1, 0, 0, 0, 66, 58, 1, 0, 0, 0, 67, 18, 1, 0, 0, 0, 68, 69, 7, 4, 0, 0, 69, 20, 1, 0, 0, 0, 70, 71, 7, 5, 0, 0, 71, 22, 1, 0, 0, 0, 6, 0, 45, 47, 54, 62, 66, 0]
\ No newline at end of file
+[4, 0, 13, 114, 6, -1, 2, 0, 7, 0, 2, 1, 7, 1, 2, 2, 7, 2, 2, 3, 7, 3, 2, 4, 7, 4, 2, 5, 7, 5, 2, 6, 7, 6, 2, 7, 7, 7, 2, 8, 7, 8, 2, 9, 7, 9, 2, 10, 7, 10, 2, 11, 7, 11, 2, 12, 7, 12, 2, 13, 7, 13, 2, 14, 7, 14, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 2, 1, 2, 1, 2, 1, 3, 1, 3, 1, 3, 3, 3, 58, 8, 3, 1, 4, 4, 4, 61, 8, 4, 11, 4, 12, 4, 62, 1, 4, 1, 4, 1, 5, 1, 5, 1, 6, 1, 6, 1, 6, 1, 7, 1, 7, 1, 8, 1, 8, 1, 8, 1, 9, 1, 9, 1, 10, 1, 10, 1, 10, 1, 10, 5, 10, 83, 8, 10, 10, 10, 12, 10, 86, 9, 10, 1, 11, 1, 11, 5, 11, 90, 8, 11, 10, 11, 12, 11, 93, 9, 11, 1, 11, 1, 11, 1, 11, 5, 11, 98, 8, 11, 10, 11, 12, 11, 101, 9, 11, 1, 11, 3, 11, 104, 8, 11, 1, 12, 4, 12, 107, 8, 12, 11, 12, 12, 12, 108, 1, 13, 1, 13, 1, 14, 1, 14, 0, 0, 15, 1, 1, 3, 2, 5, 3, 7, 4, 9, 5, 11, 6, 13, 7, 15, 8, 17, 9, 19, 10, 21, 11, 23, 12, 25, 13, 27, 0, 29, 0, 1, 0, 6, 3, 0, 9, 10, 13, 13, 32, 32, 2, 0, 45, 46, 95, 95, 1, 0, 34, 34, 1, 0, 39, 39, 1, 0, 48, 57, 2, 0, 65, 90, 97, 122, 120, 0, 1, 1, 0, 0, 0, 0, 3, 1, 0, 0, 0, 0, 5, 1, 0, 0, 0, 0, 7, 1, 0, 0, 0, 0, 9, 1, 0, 0, 0, 0, 11, 1, 0, 0, 0, 0, 13, 1, 0, 0, 0, 0, 15, 1, 0, 0, 0, 0, 17, 1, 0, 0, 0, 0, 19, 1, 0, 0, 0, 0, 21, 1, 0, 0, 0, 0, 23, 1, 0, 0, 0, 0, 25, 1, 0, 0, 0, 1, 31, 1, 0, 0, 0, 3, 40, 1, 0, 0, 0, 5, 50, 1, 0, 0, 0, 7, 57, 1, 0, 0, 0, 9, 60, 1, 0, 0, 0, 11, 66, 1, 0, 0, 0, 13, 68, 1, 0, 0, 0, 15, 71, 1, 0, 0, 0, 17, 73, 1, 0, 0, 0, 19, 76, 1, 0, 0, 0, 21, 78, 1, 0, 0, 0, 23, 103, 1, 0, 0, 0, 25, 106, 1, 0, 0, 0, 27, 110, 1, 0, 0, 0, 29, 112, 1, 0, 0, 0, 31, 32, 5, 60, 0, 0, 32, 33, 5, 87, 0, 0, 33, 34, 5, 105, 0, 0, 34, 35, 5, 110, 0, 0, 35, 36, 5, 100, 0, 0, 36, 37, 5, 111, 0, 0, 37, 38, 5, 119, 0, 0, 38, 39, 5, 62, 0, 0, 39, 2, 1, 0, 0, 0, 40, 41, 5, 60, 0, 0, 41, 42, 5, 47, 0, 0, 42, 43, 5, 87, 0, 0, 43, 44, 5, 105, 0, 0, 44, 45, 5, 110, 0, 0, 45, 46, 5, 100, 0, 0, 46, 47, 5, 111, 0, 0, 47, 48, 5, 119, 0, 0, 48, 49, 5, 62, 0, 0, 49, 4, 1, 0, 0, 0, 50, 51, 3, 11, 5, 0, 51, 52, 3, 21, 10, 0, 52, 53, 3, 17, 8, 0, 53, 6, 1, 0, 0, 0, 54, 55, 5, 112, 0, 0, 55, 58, 5, 120, 0, 0, 56, 58, 5, 37, 0, 0, 57, 54, 1, 0, 0, 0, 57, 56, 1, 0, 0, 0, 58, 8, 1, 0, 0, 0, 59, 61, 7, 0, 0, 0, 60, 59, 1, 0, 0, 0, 61, 62, 1, 0, 0, 0, 62, 60, 1, 0, 0, 0, 62, 63, 1, 0, 0, 0, 63, 64, 1, 0, 0, 0, 64, 65, 6, 4, 0, 0, 65, 10, 1, 0, 0, 0, 66, 67, 5, 60, 0, 0, 67, 12, 1, 0, 0, 0, 68, 69, 5, 60, 0, 0, 69, 70, 5, 47, 0, 0, 70, 14, 1, 0, 0, 0, 71, 72, 5, 62, 0, 0, 72, 16, 1, 0, 0, 0, 73, 74, 5, 47, 0, 0, 74, 75, 5, 62, 0, 0, 75, 18, 1, 0, 0, 0, 76, 77, 5, 61, 0, 0, 77, 20, 1, 0, 0, 0, 78, 84, 3, 29, 14, 0, 79, 83, 3, 29, 14, 0, 80, 83, 3, 27, 13, 0, 81, 83, 7, 1, 0, 0, 82, 79, 1, 0, 0, 0, 82, 80, 1, 0, 0, 0, 82, 81, 1, 0, 0, 0, 83, 86, 1, 0, 0, 0, 84, 82, 1, 0, 0, 0, 84, 85, 1, 0, 0, 0, 85, 22, 1, 0, 0, 0, 86, 84, 1, 0, 0, 0, 87, 91, 5, 34, 0, 0, 88, 90, 8, 2, 0, 0, 89, 88, 1, 0, 0, 0, 90, 93, 1, 0, 0, 0, 91, 89, 1, 0, 0, 0, 91, 92, 1, 0, 0, 0, 92, 94, 1, 0, 0, 0, 93, 91, 1, 0, 0, 0, 94, 104, 5, 34, 0, 0, 95, 99, 5, 39, 0, 0, 96, 98, 8, 3, 0, 0, 97, 96, 1, 0, 0, 0, 98, 101, 1, 0, 0, 0, 99, 97, 1, 0, 0, 0, 99, 100, 1, 0, 0, 0, 100, 102, 1, 0, 0, 0, 101, 99, 1, 0, 0, 0, 102, 104, 5, 39, 0, 0, 103, 87, 1, 0, 0, 0, 103, 95, 1, 0, 0, 0, 104, 24, 1, 0, 0, 0, 105, 107, 3, 27, 13, 0, 106, 105, 1, 0, 0, 0, 107, 108, 1, 0, 0, 0, 108, 106, 1, 0, 0, 0, 108, 109, 1, 0, 0, 0, 109, 26, 1, 0, 0, 0, 110, 111, 7, 4, 0, 0, 111, 28, 1, 0, 0, 0, 112, 113, 7, 5, 0, 0, 113, 30, 1, 0, 0, 0, 9, 0, 57, 62, 82, 84, 91, 99, 103, 108, 1, 6, 0, 0]
\ No newline at end of file
diff --git a/src/main/java/controlP5/layout/lang/XMLLexer.java b/src/main/java/controlP5/layout/lang/XMLLexer.java
index 5bd5599..f634b64 100644
--- a/src/main/java/controlP5/layout/lang/XMLLexer.java
+++ b/src/main/java/controlP5/layout/lang/XMLLexer.java
@@ -17,8 +17,8 @@ public class XMLLexer extends Lexer {
 	protected static final PredictionContextCache _sharedContextCache =
 		new PredictionContextCache();
 	public static final int
-		SELF_CLOSING=1, SPACE=2, OPEN=3, OPEN_SLASH=4, CLOSE=5, SLASH_CLOSE=6, 
-		EQUALS=7, Name=8, STRING=9;
+		T__0=1, T__1=2, SELF_CLOSING=3, UNIT=4, WS=5, OPEN=6, OPEN_SLASH=7, CLOSE=8, 
+		SLASH_CLOSE=9, EQUALS=10, Name=11, STRING=12, NUMBER=13;
 	public static String[] channelNames = {
 		"DEFAULT_TOKEN_CHANNEL", "HIDDEN"
 	};
@@ -29,22 +29,23 @@ public class XMLLexer extends Lexer {
 
 	private static String[] makeRuleNames() {
 		return new String[] {
-			"SELF_CLOSING", "SPACE", "OPEN", "OPEN_SLASH", "CLOSE", "SLASH_CLOSE", 
-			"EQUALS", "Name", "STRING", "DIGIT", "ALPHA"
+			"T__0", "T__1", "SELF_CLOSING", "UNIT", "WS", "OPEN", "OPEN_SLASH", "CLOSE", 
+			"SLASH_CLOSE", "EQUALS", "Name", "STRING", "NUMBER", "DIGIT", "ALPHA"
 		};
 	}
 	public static final String[] ruleNames = makeRuleNames();
 
 	private static String[] makeLiteralNames() {
 		return new String[] {
-			null, null, null, "'<'", "'</'", "'>'", "'/>'", "'='"
+			null, "'<Window>'", "'</Window>'", null, null, null, "'<'", "'</'", "'>'", 
+			"'/>'", "'='"
 		};
 	}
 	private static final String[] _LITERAL_NAMES = makeLiteralNames();
 	private static String[] makeSymbolicNames() {
 		return new String[] {
-			null, "SELF_CLOSING", "SPACE", "OPEN", "OPEN_SLASH", "CLOSE", "SLASH_CLOSE", 
-			"EQUALS", "Name", "STRING"
+			null, null, null, "SELF_CLOSING", "UNIT", "WS", "OPEN", "OPEN_SLASH", 
+			"CLOSE", "SLASH_CLOSE", "EQUALS", "Name", "STRING", "NUMBER"
 		};
 	}
 	private static final String[] _SYMBOLIC_NAMES = makeSymbolicNames();
@@ -106,50 +107,73 @@ public class XMLLexer extends Lexer {
 	public ATN getATN() { return _ATN; }
 
 	public static final String _serializedATN =
-		"\u0004\u0000\tH\u0006\uffff\uffff\u0002\u0000\u0007\u0000\u0002\u0001"+
+		"\u0004\u0000\rr\u0006\uffff\uffff\u0002\u0000\u0007\u0000\u0002\u0001"+
 		"\u0007\u0001\u0002\u0002\u0007\u0002\u0002\u0003\u0007\u0003\u0002\u0004"+
 		"\u0007\u0004\u0002\u0005\u0007\u0005\u0002\u0006\u0007\u0006\u0002\u0007"+
-		"\u0007\u0007\u0002\b\u0007\b\u0002\t\u0007\t\u0002\n\u0007\n\u0001\u0000"+
-		"\u0001\u0000\u0001\u0000\u0001\u0000\u0001\u0001\u0001\u0001\u0001\u0002"+
-		"\u0001\u0002\u0001\u0003\u0001\u0003\u0001\u0003\u0001\u0004\u0001\u0004"+
-		"\u0001\u0005\u0001\u0005\u0001\u0005\u0001\u0006\u0001\u0006\u0001\u0007"+
-		"\u0001\u0007\u0001\u0007\u0001\u0007\u0005\u0007.\b\u0007\n\u0007\f\u0007"+
-		"1\t\u0007\u0001\b\u0001\b\u0005\b5\b\b\n\b\f\b8\t\b\u0001\b\u0001\b\u0001"+
-		"\b\u0005\b=\b\b\n\b\f\b@\t\b\u0001\b\u0003\bC\b\b\u0001\t\u0001\t\u0001"+
-		"\n\u0001\n\u0000\u0000\u000b\u0001\u0001\u0003\u0002\u0005\u0003\u0007"+
-		"\u0004\t\u0005\u000b\u0006\r\u0007\u000f\b\u0011\t\u0013\u0000\u0015\u0000"+
-		"\u0001\u0000\u0006\u0003\u0000\t\n\r\r  \u0002\u0000-.__\u0001\u0000\""+
-		"\"\u0001\u0000\'\'\u0001\u000009\u0002\u0000AZazK\u0000\u0001\u0001\u0000"+
-		"\u0000\u0000\u0000\u0003\u0001\u0000\u0000\u0000\u0000\u0005\u0001\u0000"+
-		"\u0000\u0000\u0000\u0007\u0001\u0000\u0000\u0000\u0000\t\u0001\u0000\u0000"+
-		"\u0000\u0000\u000b\u0001\u0000\u0000\u0000\u0000\r\u0001\u0000\u0000\u0000"+
-		"\u0000\u000f\u0001\u0000\u0000\u0000\u0000\u0011\u0001\u0000\u0000\u0000"+
-		"\u0001\u0017\u0001\u0000\u0000\u0000\u0003\u001b\u0001\u0000\u0000\u0000"+
-		"\u0005\u001d\u0001\u0000\u0000\u0000\u0007\u001f\u0001\u0000\u0000\u0000"+
-		"\t\"\u0001\u0000\u0000\u0000\u000b$\u0001\u0000\u0000\u0000\r\'\u0001"+
-		"\u0000\u0000\u0000\u000f)\u0001\u0000\u0000\u0000\u0011B\u0001\u0000\u0000"+
-		"\u0000\u0013D\u0001\u0000\u0000\u0000\u0015F\u0001\u0000\u0000\u0000\u0017"+
-		"\u0018\u0003\u0005\u0002\u0000\u0018\u0019\u0003\u000f\u0007\u0000\u0019"+
-		"\u001a\u0003\u000b\u0005\u0000\u001a\u0002\u0001\u0000\u0000\u0000\u001b"+
-		"\u001c\u0007\u0000\u0000\u0000\u001c\u0004\u0001\u0000\u0000\u0000\u001d"+
-		"\u001e\u0005<\u0000\u0000\u001e\u0006\u0001\u0000\u0000\u0000\u001f \u0005"+
-		"<\u0000\u0000 !\u0005/\u0000\u0000!\b\u0001\u0000\u0000\u0000\"#\u0005"+
-		">\u0000\u0000#\n\u0001\u0000\u0000\u0000$%\u0005/\u0000\u0000%&\u0005"+
-		">\u0000\u0000&\f\u0001\u0000\u0000\u0000\'(\u0005=\u0000\u0000(\u000e"+
-		"\u0001\u0000\u0000\u0000)/\u0003\u0015\n\u0000*.\u0003\u0015\n\u0000+"+
-		".\u0003\u0013\t\u0000,.\u0007\u0001\u0000\u0000-*\u0001\u0000\u0000\u0000"+
-		"-+\u0001\u0000\u0000\u0000-,\u0001\u0000\u0000\u0000.1\u0001\u0000\u0000"+
-		"\u0000/-\u0001\u0000\u0000\u0000/0\u0001\u0000\u0000\u00000\u0010\u0001"+
-		"\u0000\u0000\u00001/\u0001\u0000\u0000\u000026\u0005\"\u0000\u000035\b"+
-		"\u0002\u0000\u000043\u0001\u0000\u0000\u000058\u0001\u0000\u0000\u0000"+
-		"64\u0001\u0000\u0000\u000067\u0001\u0000\u0000\u000079\u0001\u0000\u0000"+
-		"\u000086\u0001\u0000\u0000\u00009C\u0005\"\u0000\u0000:>\u0005\'\u0000"+
-		"\u0000;=\b\u0003\u0000\u0000<;\u0001\u0000\u0000\u0000=@\u0001\u0000\u0000"+
-		"\u0000><\u0001\u0000\u0000\u0000>?\u0001\u0000\u0000\u0000?A\u0001\u0000"+
-		"\u0000\u0000@>\u0001\u0000\u0000\u0000AC\u0005\'\u0000\u0000B2\u0001\u0000"+
-		"\u0000\u0000B:\u0001\u0000\u0000\u0000C\u0012\u0001\u0000\u0000\u0000"+
-		"DE\u0007\u0004\u0000\u0000E\u0014\u0001\u0000\u0000\u0000FG\u0007\u0005"+
-		"\u0000\u0000G\u0016\u0001\u0000\u0000\u0000\u0006\u0000-/6>B\u0000";
+		"\u0007\u0007\u0002\b\u0007\b\u0002\t\u0007\t\u0002\n\u0007\n\u0002\u000b"+
+		"\u0007\u000b\u0002\f\u0007\f\u0002\r\u0007\r\u0002\u000e\u0007\u000e\u0001"+
+		"\u0000\u0001\u0000\u0001\u0000\u0001\u0000\u0001\u0000\u0001\u0000\u0001"+
+		"\u0000\u0001\u0000\u0001\u0000\u0001\u0001\u0001\u0001\u0001\u0001\u0001"+
+		"\u0001\u0001\u0001\u0001\u0001\u0001\u0001\u0001\u0001\u0001\u0001\u0001"+
+		"\u0001\u0001\u0002\u0001\u0002\u0001\u0002\u0001\u0002\u0001\u0003\u0001"+
+		"\u0003\u0001\u0003\u0003\u0003:\b\u0003\u0001\u0004\u0004\u0004=\b\u0004"+
+		"\u000b\u0004\f\u0004>\u0001\u0004\u0001\u0004\u0001\u0005\u0001\u0005"+
+		"\u0001\u0006\u0001\u0006\u0001\u0006\u0001\u0007\u0001\u0007\u0001\b\u0001"+
+		"\b\u0001\b\u0001\t\u0001\t\u0001\n\u0001\n\u0001\n\u0001\n\u0005\nS\b"+
+		"\n\n\n\f\nV\t\n\u0001\u000b\u0001\u000b\u0005\u000bZ\b\u000b\n\u000b\f"+
+		"\u000b]\t\u000b\u0001\u000b\u0001\u000b\u0001\u000b\u0005\u000bb\b\u000b"+
+		"\n\u000b\f\u000be\t\u000b\u0001\u000b\u0003\u000bh\b\u000b\u0001\f\u0004"+
+		"\fk\b\f\u000b\f\f\fl\u0001\r\u0001\r\u0001\u000e\u0001\u000e\u0000\u0000"+
+		"\u000f\u0001\u0001\u0003\u0002\u0005\u0003\u0007\u0004\t\u0005\u000b\u0006"+
+		"\r\u0007\u000f\b\u0011\t\u0013\n\u0015\u000b\u0017\f\u0019\r\u001b\u0000"+
+		"\u001d\u0000\u0001\u0000\u0006\u0003\u0000\t\n\r\r  \u0002\u0000-.__\u0001"+
+		"\u0000\"\"\u0001\u0000\'\'\u0001\u000009\u0002\u0000AZazx\u0000\u0001"+
+		"\u0001\u0000\u0000\u0000\u0000\u0003\u0001\u0000\u0000\u0000\u0000\u0005"+
+		"\u0001\u0000\u0000\u0000\u0000\u0007\u0001\u0000\u0000\u0000\u0000\t\u0001"+
+		"\u0000\u0000\u0000\u0000\u000b\u0001\u0000\u0000\u0000\u0000\r\u0001\u0000"+
+		"\u0000\u0000\u0000\u000f\u0001\u0000\u0000\u0000\u0000\u0011\u0001\u0000"+
+		"\u0000\u0000\u0000\u0013\u0001\u0000\u0000\u0000\u0000\u0015\u0001\u0000"+
+		"\u0000\u0000\u0000\u0017\u0001\u0000\u0000\u0000\u0000\u0019\u0001\u0000"+
+		"\u0000\u0000\u0001\u001f\u0001\u0000\u0000\u0000\u0003(\u0001\u0000\u0000"+
+		"\u0000\u00052\u0001\u0000\u0000\u0000\u00079\u0001\u0000\u0000\u0000\t"+
+		"<\u0001\u0000\u0000\u0000\u000bB\u0001\u0000\u0000\u0000\rD\u0001\u0000"+
+		"\u0000\u0000\u000fG\u0001\u0000\u0000\u0000\u0011I\u0001\u0000\u0000\u0000"+
+		"\u0013L\u0001\u0000\u0000\u0000\u0015N\u0001\u0000\u0000\u0000\u0017g"+
+		"\u0001\u0000\u0000\u0000\u0019j\u0001\u0000\u0000\u0000\u001bn\u0001\u0000"+
+		"\u0000\u0000\u001dp\u0001\u0000\u0000\u0000\u001f \u0005<\u0000\u0000"+
+		" !\u0005W\u0000\u0000!\"\u0005i\u0000\u0000\"#\u0005n\u0000\u0000#$\u0005"+
+		"d\u0000\u0000$%\u0005o\u0000\u0000%&\u0005w\u0000\u0000&\'\u0005>\u0000"+
+		"\u0000\'\u0002\u0001\u0000\u0000\u0000()\u0005<\u0000\u0000)*\u0005/\u0000"+
+		"\u0000*+\u0005W\u0000\u0000+,\u0005i\u0000\u0000,-\u0005n\u0000\u0000"+
+		"-.\u0005d\u0000\u0000./\u0005o\u0000\u0000/0\u0005w\u0000\u000001\u0005"+
+		">\u0000\u00001\u0004\u0001\u0000\u0000\u000023\u0003\u000b\u0005\u0000"+
+		"34\u0003\u0015\n\u000045\u0003\u0011\b\u00005\u0006\u0001\u0000\u0000"+
+		"\u000067\u0005p\u0000\u00007:\u0005x\u0000\u00008:\u0005%\u0000\u0000"+
+		"96\u0001\u0000\u0000\u000098\u0001\u0000\u0000\u0000:\b\u0001\u0000\u0000"+
+		"\u0000;=\u0007\u0000\u0000\u0000<;\u0001\u0000\u0000\u0000=>\u0001\u0000"+
+		"\u0000\u0000><\u0001\u0000\u0000\u0000>?\u0001\u0000\u0000\u0000?@\u0001"+
+		"\u0000\u0000\u0000@A\u0006\u0004\u0000\u0000A\n\u0001\u0000\u0000\u0000"+
+		"BC\u0005<\u0000\u0000C\f\u0001\u0000\u0000\u0000DE\u0005<\u0000\u0000"+
+		"EF\u0005/\u0000\u0000F\u000e\u0001\u0000\u0000\u0000GH\u0005>\u0000\u0000"+
+		"H\u0010\u0001\u0000\u0000\u0000IJ\u0005/\u0000\u0000JK\u0005>\u0000\u0000"+
+		"K\u0012\u0001\u0000\u0000\u0000LM\u0005=\u0000\u0000M\u0014\u0001\u0000"+
+		"\u0000\u0000NT\u0003\u001d\u000e\u0000OS\u0003\u001d\u000e\u0000PS\u0003"+
+		"\u001b\r\u0000QS\u0007\u0001\u0000\u0000RO\u0001\u0000\u0000\u0000RP\u0001"+
+		"\u0000\u0000\u0000RQ\u0001\u0000\u0000\u0000SV\u0001\u0000\u0000\u0000"+
+		"TR\u0001\u0000\u0000\u0000TU\u0001\u0000\u0000\u0000U\u0016\u0001\u0000"+
+		"\u0000\u0000VT\u0001\u0000\u0000\u0000W[\u0005\"\u0000\u0000XZ\b\u0002"+
+		"\u0000\u0000YX\u0001\u0000\u0000\u0000Z]\u0001\u0000\u0000\u0000[Y\u0001"+
+		"\u0000\u0000\u0000[\\\u0001\u0000\u0000\u0000\\^\u0001\u0000\u0000\u0000"+
+		"][\u0001\u0000\u0000\u0000^h\u0005\"\u0000\u0000_c\u0005\'\u0000\u0000"+
+		"`b\b\u0003\u0000\u0000a`\u0001\u0000\u0000\u0000be\u0001\u0000\u0000\u0000"+
+		"ca\u0001\u0000\u0000\u0000cd\u0001\u0000\u0000\u0000df\u0001\u0000\u0000"+
+		"\u0000ec\u0001\u0000\u0000\u0000fh\u0005\'\u0000\u0000gW\u0001\u0000\u0000"+
+		"\u0000g_\u0001\u0000\u0000\u0000h\u0018\u0001\u0000\u0000\u0000ik\u0003"+
+		"\u001b\r\u0000ji\u0001\u0000\u0000\u0000kl\u0001\u0000\u0000\u0000lj\u0001"+
+		"\u0000\u0000\u0000lm\u0001\u0000\u0000\u0000m\u001a\u0001\u0000\u0000"+
+		"\u0000no\u0007\u0004\u0000\u0000o\u001c\u0001\u0000\u0000\u0000pq\u0007"+
+		"\u0005\u0000\u0000q\u001e\u0001\u0000\u0000\u0000\t\u00009>RT[cgl\u0001"+
+		"\u0006\u0000\u0000";
 	public static final ATN _ATN =
 		new ATNDeserializer().deserialize(_serializedATN.toCharArray());
 	static {
diff --git a/src/main/java/controlP5/layout/lang/XMLLexer.tokens b/src/main/java/controlP5/layout/lang/XMLLexer.tokens
index f1d8167..30d639a 100644
--- a/src/main/java/controlP5/layout/lang/XMLLexer.tokens
+++ b/src/main/java/controlP5/layout/lang/XMLLexer.tokens
@@ -1,14 +1,20 @@
-SELF_CLOSING=1
-SPACE=2
-OPEN=3
-OPEN_SLASH=4
-CLOSE=5
-SLASH_CLOSE=6
-EQUALS=7
-Name=8
-STRING=9
-'<'=3
-'</'=4
-'>'=5
-'/>'=6
-'='=7
+T__0=1
+T__1=2
+SELF_CLOSING=3
+UNIT=4
+WS=5
+OPEN=6
+OPEN_SLASH=7
+CLOSE=8
+SLASH_CLOSE=9
+EQUALS=10
+Name=11
+STRING=12
+NUMBER=13
+'<Window>'=1
+'</Window>'=2
+'<'=6
+'</'=7
+'>'=8
+'/>'=9
+'='=10
diff --git a/src/main/java/controlP5/layout/lang/XMLListener.java b/src/main/java/controlP5/layout/lang/XMLListener.java
index d045f82..affbd5b 100644
--- a/src/main/java/controlP5/layout/lang/XMLListener.java
+++ b/src/main/java/controlP5/layout/lang/XMLListener.java
@@ -67,4 +67,14 @@ public interface XMLListener extends ParseTreeListener {
 	 * @param ctx the parse tree
 	 */
 	void exitContent(XMLParser.ContentContext ctx);
+	/**
+	 * Enter a parse tree produced by {@link XMLParser#value}.
+	 * @param ctx the parse tree
+	 */
+	void enterValue(XMLParser.ValueContext ctx);
+	/**
+	 * Exit a parse tree produced by {@link XMLParser#value}.
+	 * @param ctx the parse tree
+	 */
+	void exitValue(XMLParser.ValueContext ctx);
 }
\ No newline at end of file
diff --git a/src/main/java/controlP5/layout/lang/XMLParser.java b/src/main/java/controlP5/layout/lang/XMLParser.java
index 108f27e..0e79aa2 100644
--- a/src/main/java/controlP5/layout/lang/XMLParser.java
+++ b/src/main/java/controlP5/layout/lang/XMLParser.java
@@ -17,28 +17,30 @@ public class XMLParser extends Parser {
 	protected static final PredictionContextCache _sharedContextCache =
 		new PredictionContextCache();
 	public static final int
-		SELF_CLOSING=1, SPACE=2, OPEN=3, OPEN_SLASH=4, CLOSE=5, SLASH_CLOSE=6, 
-		EQUALS=7, Name=8, STRING=9;
+		T__0=1, T__1=2, SELF_CLOSING=3, UNIT=4, WS=5, OPEN=6, OPEN_SLASH=7, CLOSE=8, 
+		SLASH_CLOSE=9, EQUALS=10, Name=11, STRING=12, NUMBER=13;
 	public static final int
 		RULE_document = 0, RULE_element = 1, RULE_startTag = 2, RULE_endTag = 3, 
-		RULE_attribute = 4, RULE_content = 5;
+		RULE_attribute = 4, RULE_content = 5, RULE_value = 6;
 	private static String[] makeRuleNames() {
 		return new String[] {
-			"document", "element", "startTag", "endTag", "attribute", "content"
+			"document", "element", "startTag", "endTag", "attribute", "content", 
+			"value"
 		};
 	}
 	public static final String[] ruleNames = makeRuleNames();
 
 	private static String[] makeLiteralNames() {
 		return new String[] {
-			null, null, null, "'<'", "'</'", "'>'", "'/>'", "'='"
+			null, "'<Window>'", "'</Window>'", null, null, null, "'<'", "'</'", "'>'", 
+			"'/>'", "'='"
 		};
 	}
 	private static final String[] _LITERAL_NAMES = makeLiteralNames();
 	private static String[] makeSymbolicNames() {
 		return new String[] {
-			null, "SELF_CLOSING", "SPACE", "OPEN", "OPEN_SLASH", "CLOSE", "SLASH_CLOSE", 
-			"EQUALS", "Name", "STRING"
+			null, null, null, "SELF_CLOSING", "UNIT", "WS", "OPEN", "OPEN_SLASH", 
+			"CLOSE", "SLASH_CLOSE", "EQUALS", "Name", "STRING", "NUMBER"
 		};
 	}
 	private static final String[] _SYMBOLIC_NAMES = makeSymbolicNames();
@@ -94,10 +96,12 @@ public class XMLParser extends Parser {
 
 	@SuppressWarnings("CheckReturnValue")
 	public static class DocumentContext extends ParserRuleContext {
-		public ElementContext element() {
-			return getRuleContext(ElementContext.class,0);
+		public List<ElementContext> element() {
+			return getRuleContexts(ElementContext.class);
+		}
+		public ElementContext element(int i) {
+			return getRuleContext(ElementContext.class,i);
 		}
-		public TerminalNode EOF() { return getToken(XMLParser.EOF, 0); }
 		public DocumentContext(ParserRuleContext parent, int invokingState) {
 			super(parent, invokingState);
 		}
@@ -110,18 +114,38 @@ public class XMLParser extends Parser {
 		public void exitRule(ParseTreeListener listener) {
 			if ( listener instanceof XMLListener ) ((XMLListener)listener).exitDocument(this);
 		}
+		@Override
+		public <T> T accept(ParseTreeVisitor<? extends T> visitor) {
+			if ( visitor instanceof XMLVisitor ) return ((XMLVisitor<? extends T>)visitor).visitDocument(this);
+			else return visitor.visitChildren(this);
+		}
 	}
 
 	public final DocumentContext document() throws RecognitionException {
 		DocumentContext _localctx = new DocumentContext(_ctx, getState());
 		enterRule(_localctx, 0, RULE_document);
+		int _la;
 		try {
 			enterOuterAlt(_localctx, 1);
 			{
-			setState(12);
-			element();
-			setState(13);
-			match(EOF);
+			setState(14);
+			match(T__0);
+			setState(16); 
+			_errHandler.sync(this);
+			_la = _input.LA(1);
+			do {
+				{
+				{
+				setState(15);
+				element();
+				}
+				}
+				setState(18); 
+				_errHandler.sync(this);
+				_la = _input.LA(1);
+			} while ( _la==SELF_CLOSING || _la==OPEN );
+			setState(20);
+			match(T__1);
 			}
 		}
 		catch (RecognitionException re) {
@@ -143,15 +167,8 @@ public class XMLParser extends Parser {
 		public EndTagContext endTag() {
 			return getRuleContext(EndTagContext.class,0);
 		}
-		public List<ContentContext> content() {
-			return getRuleContexts(ContentContext.class);
-		}
-		public ContentContext content(int i) {
-			return getRuleContext(ContentContext.class,i);
-		}
-		public List<TerminalNode> SPACE() { return getTokens(XMLParser.SPACE); }
-		public TerminalNode SPACE(int i) {
-			return getToken(XMLParser.SPACE, i);
+		public ContentContext content() {
+			return getRuleContext(ContentContext.class,0);
 		}
 		public TerminalNode SELF_CLOSING() { return getToken(XMLParser.SELF_CLOSING, 0); }
 		public ElementContext(ParserRuleContext parent, int invokingState) {
@@ -166,6 +183,11 @@ public class XMLParser extends Parser {
 		public void exitRule(ParseTreeListener listener) {
 			if ( listener instanceof XMLListener ) ((XMLListener)listener).exitElement(this);
 		}
+		@Override
+		public <T> T accept(ParseTreeVisitor<? extends T> visitor) {
+			if ( visitor instanceof XMLVisitor ) return ((XMLVisitor<? extends T>)visitor).visitElement(this);
+			else return visitor.visitChildren(this);
+		}
 	}
 
 	public final ElementContext element() throws RecognitionException {
@@ -173,52 +195,32 @@ public class XMLParser extends Parser {
 		enterRule(_localctx, 2, RULE_element);
 		int _la;
 		try {
-			setState(26);
+			setState(29);
 			_errHandler.sync(this);
 			switch (_input.LA(1)) {
 			case OPEN:
 				enterOuterAlt(_localctx, 1);
 				{
-				setState(15);
+				setState(22);
 				startTag();
-				setState(20);
+				setState(24);
 				_errHandler.sync(this);
 				_la = _input.LA(1);
-				while ((((_la) & ~0x3f) == 0 && ((1L << _la) & 526L) != 0)) {
+				if ((((_la) & ~0x3f) == 0 && ((1L << _la) & 4168L) != 0)) {
 					{
-					setState(18);
-					_errHandler.sync(this);
-					switch (_input.LA(1)) {
-					case SELF_CLOSING:
-					case OPEN:
-					case STRING:
-						{
-						setState(16);
-						content();
-						}
-						break;
-					case SPACE:
-						{
-						setState(17);
-						match(SPACE);
-						}
-						break;
-					default:
-						throw new NoViableAltException(this);
+					setState(23);
+					content();
 					}
-					}
-					setState(22);
-					_errHandler.sync(this);
-					_la = _input.LA(1);
 				}
-				setState(23);
+
+				setState(26);
 				endTag();
 				}
 				break;
 			case SELF_CLOSING:
 				enterOuterAlt(_localctx, 2);
 				{
-				setState(25);
+				setState(28);
 				match(SELF_CLOSING);
 				}
 				break;
@@ -260,6 +262,11 @@ public class XMLParser extends Parser {
 		public void exitRule(ParseTreeListener listener) {
 			if ( listener instanceof XMLListener ) ((XMLListener)listener).exitStartTag(this);
 		}
+		@Override
+		public <T> T accept(ParseTreeVisitor<? extends T> visitor) {
+			if ( visitor instanceof XMLVisitor ) return ((XMLVisitor<? extends T>)visitor).visitStartTag(this);
+			else return visitor.visitChildren(this);
+		}
 	}
 
 	public final StartTagContext startTag() throws RecognitionException {
@@ -269,25 +276,25 @@ public class XMLParser extends Parser {
 		try {
 			enterOuterAlt(_localctx, 1);
 			{
-			setState(28);
+			setState(31);
 			match(OPEN);
-			setState(29);
+			setState(32);
 			match(Name);
-			setState(33);
+			setState(36);
 			_errHandler.sync(this);
 			_la = _input.LA(1);
 			while (_la==Name) {
 				{
 				{
-				setState(30);
+				setState(33);
 				attribute();
 				}
 				}
-				setState(35);
+				setState(38);
 				_errHandler.sync(this);
 				_la = _input.LA(1);
 			}
-			setState(36);
+			setState(39);
 			match(CLOSE);
 			}
 		}
@@ -319,6 +326,11 @@ public class XMLParser extends Parser {
 		public void exitRule(ParseTreeListener listener) {
 			if ( listener instanceof XMLListener ) ((XMLListener)listener).exitEndTag(this);
 		}
+		@Override
+		public <T> T accept(ParseTreeVisitor<? extends T> visitor) {
+			if ( visitor instanceof XMLVisitor ) return ((XMLVisitor<? extends T>)visitor).visitEndTag(this);
+			else return visitor.visitChildren(this);
+		}
 	}
 
 	public final EndTagContext endTag() throws RecognitionException {
@@ -327,11 +339,11 @@ public class XMLParser extends Parser {
 		try {
 			enterOuterAlt(_localctx, 1);
 			{
-			setState(38);
+			setState(41);
 			match(OPEN_SLASH);
-			setState(39);
+			setState(42);
 			match(Name);
-			setState(40);
+			setState(43);
 			match(CLOSE);
 			}
 		}
@@ -350,7 +362,9 @@ public class XMLParser extends Parser {
 	public static class AttributeContext extends ParserRuleContext {
 		public TerminalNode Name() { return getToken(XMLParser.Name, 0); }
 		public TerminalNode EQUALS() { return getToken(XMLParser.EQUALS, 0); }
-		public TerminalNode STRING() { return getToken(XMLParser.STRING, 0); }
+		public ValueContext value() {
+			return getRuleContext(ValueContext.class,0);
+		}
 		public AttributeContext(ParserRuleContext parent, int invokingState) {
 			super(parent, invokingState);
 		}
@@ -363,6 +377,11 @@ public class XMLParser extends Parser {
 		public void exitRule(ParseTreeListener listener) {
 			if ( listener instanceof XMLListener ) ((XMLListener)listener).exitAttribute(this);
 		}
+		@Override
+		public <T> T accept(ParseTreeVisitor<? extends T> visitor) {
+			if ( visitor instanceof XMLVisitor ) return ((XMLVisitor<? extends T>)visitor).visitAttribute(this);
+			else return visitor.visitChildren(this);
+		}
 	}
 
 	public final AttributeContext attribute() throws RecognitionException {
@@ -371,12 +390,12 @@ public class XMLParser extends Parser {
 		try {
 			enterOuterAlt(_localctx, 1);
 			{
-			setState(42);
+			setState(45);
 			match(Name);
-			setState(43);
+			setState(46);
 			match(EQUALS);
-			setState(44);
-			match(STRING);
+			setState(47);
+			value();
 			}
 		}
 		catch (RecognitionException re) {
@@ -408,27 +427,32 @@ public class XMLParser extends Parser {
 		public void exitRule(ParseTreeListener listener) {
 			if ( listener instanceof XMLListener ) ((XMLListener)listener).exitContent(this);
 		}
+		@Override
+		public <T> T accept(ParseTreeVisitor<? extends T> visitor) {
+			if ( visitor instanceof XMLVisitor ) return ((XMLVisitor<? extends T>)visitor).visitContent(this);
+			else return visitor.visitChildren(this);
+		}
 	}
 
 	public final ContentContext content() throws RecognitionException {
 		ContentContext _localctx = new ContentContext(_ctx, getState());
 		enterRule(_localctx, 10, RULE_content);
 		try {
-			setState(48);
+			setState(51);
 			_errHandler.sync(this);
 			switch (_input.LA(1)) {
 			case SELF_CLOSING:
 			case OPEN:
 				enterOuterAlt(_localctx, 1);
 				{
-				setState(46);
+				setState(49);
 				element();
 				}
 				break;
 			case STRING:
 				enterOuterAlt(_localctx, 2);
 				{
-				setState(47);
+				setState(50);
 				match(STRING);
 				}
 				break;
@@ -447,38 +471,105 @@ public class XMLParser extends Parser {
 		return _localctx;
 	}
 
+	@SuppressWarnings("CheckReturnValue")
+	public static class ValueContext extends ParserRuleContext {
+		public TerminalNode STRING() { return getToken(XMLParser.STRING, 0); }
+		public TerminalNode NUMBER() { return getToken(XMLParser.NUMBER, 0); }
+		public TerminalNode UNIT() { return getToken(XMLParser.UNIT, 0); }
+		public ValueContext(ParserRuleContext parent, int invokingState) {
+			super(parent, invokingState);
+		}
+		@Override public int getRuleIndex() { return RULE_value; }
+		@Override
+		public void enterRule(ParseTreeListener listener) {
+			if ( listener instanceof XMLListener ) ((XMLListener)listener).enterValue(this);
+		}
+		@Override
+		public void exitRule(ParseTreeListener listener) {
+			if ( listener instanceof XMLListener ) ((XMLListener)listener).exitValue(this);
+		}
+		@Override
+		public <T> T accept(ParseTreeVisitor<? extends T> visitor) {
+			if ( visitor instanceof XMLVisitor ) return ((XMLVisitor<? extends T>)visitor).visitValue(this);
+			else return visitor.visitChildren(this);
+		}
+	}
+
+	public final ValueContext value() throws RecognitionException {
+		ValueContext _localctx = new ValueContext(_ctx, getState());
+		enterRule(_localctx, 12, RULE_value);
+		try {
+			setState(56);
+			_errHandler.sync(this);
+			switch (_input.LA(1)) {
+			case STRING:
+				enterOuterAlt(_localctx, 1);
+				{
+				setState(53);
+				match(STRING);
+				}
+				break;
+			case NUMBER:
+				enterOuterAlt(_localctx, 2);
+				{
+				setState(54);
+				match(NUMBER);
+				setState(55);
+				match(UNIT);
+				}
+				break;
+			default:
+				throw new NoViableAltException(this);
+			}
+		}
+		catch (RecognitionException re) {
+			_localctx.exception = re;
+			_errHandler.reportError(this, re);
+			_errHandler.recover(this, re);
+		}
+		finally {
+			exitRule();
+		}
+		return _localctx;
+	}
+
 	public static final String _serializedATN =
-		"\u0004\u0001\t3\u0002\u0000\u0007\u0000\u0002\u0001\u0007\u0001\u0002"+
+		"\u0004\u0001\r;\u0002\u0000\u0007\u0000\u0002\u0001\u0007\u0001\u0002"+
 		"\u0002\u0007\u0002\u0002\u0003\u0007\u0003\u0002\u0004\u0007\u0004\u0002"+
-		"\u0005\u0007\u0005\u0001\u0000\u0001\u0000\u0001\u0000\u0001\u0001\u0001"+
-		"\u0001\u0001\u0001\u0005\u0001\u0013\b\u0001\n\u0001\f\u0001\u0016\t\u0001"+
-		"\u0001\u0001\u0001\u0001\u0001\u0001\u0003\u0001\u001b\b\u0001\u0001\u0002"+
-		"\u0001\u0002\u0001\u0002\u0005\u0002 \b\u0002\n\u0002\f\u0002#\t\u0002"+
-		"\u0001\u0002\u0001\u0002\u0001\u0003\u0001\u0003\u0001\u0003\u0001\u0003"+
-		"\u0001\u0004\u0001\u0004\u0001\u0004\u0001\u0004\u0001\u0005\u0001\u0005"+
-		"\u0003\u00051\b\u0005\u0001\u0005\u0000\u0000\u0006\u0000\u0002\u0004"+
-		"\u0006\b\n\u0000\u00001\u0000\f\u0001\u0000\u0000\u0000\u0002\u001a\u0001"+
-		"\u0000\u0000\u0000\u0004\u001c\u0001\u0000\u0000\u0000\u0006&\u0001\u0000"+
-		"\u0000\u0000\b*\u0001\u0000\u0000\u0000\n0\u0001\u0000\u0000\u0000\f\r"+
-		"\u0003\u0002\u0001\u0000\r\u000e\u0005\u0000\u0000\u0001\u000e\u0001\u0001"+
-		"\u0000\u0000\u0000\u000f\u0014\u0003\u0004\u0002\u0000\u0010\u0013\u0003"+
-		"\n\u0005\u0000\u0011\u0013\u0005\u0002\u0000\u0000\u0012\u0010\u0001\u0000"+
-		"\u0000\u0000\u0012\u0011\u0001\u0000\u0000\u0000\u0013\u0016\u0001\u0000"+
-		"\u0000\u0000\u0014\u0012\u0001\u0000\u0000\u0000\u0014\u0015\u0001\u0000"+
-		"\u0000\u0000\u0015\u0017\u0001\u0000\u0000\u0000\u0016\u0014\u0001\u0000"+
-		"\u0000\u0000\u0017\u0018\u0003\u0006\u0003\u0000\u0018\u001b\u0001\u0000"+
-		"\u0000\u0000\u0019\u001b\u0005\u0001\u0000\u0000\u001a\u000f\u0001\u0000"+
-		"\u0000\u0000\u001a\u0019\u0001\u0000\u0000\u0000\u001b\u0003\u0001\u0000"+
-		"\u0000\u0000\u001c\u001d\u0005\u0003\u0000\u0000\u001d!\u0005\b\u0000"+
-		"\u0000\u001e \u0003\b\u0004\u0000\u001f\u001e\u0001\u0000\u0000\u0000"+
-		" #\u0001\u0000\u0000\u0000!\u001f\u0001\u0000\u0000\u0000!\"\u0001\u0000"+
-		"\u0000\u0000\"$\u0001\u0000\u0000\u0000#!\u0001\u0000\u0000\u0000$%\u0005"+
-		"\u0005\u0000\u0000%\u0005\u0001\u0000\u0000\u0000&\'\u0005\u0004\u0000"+
-		"\u0000\'(\u0005\b\u0000\u0000()\u0005\u0005\u0000\u0000)\u0007\u0001\u0000"+
-		"\u0000\u0000*+\u0005\b\u0000\u0000+,\u0005\u0007\u0000\u0000,-\u0005\t"+
-		"\u0000\u0000-\t\u0001\u0000\u0000\u0000.1\u0003\u0002\u0001\u0000/1\u0005"+
-		"\t\u0000\u00000.\u0001\u0000\u0000\u00000/\u0001\u0000\u0000\u00001\u000b"+
-		"\u0001\u0000\u0000\u0000\u0005\u0012\u0014\u001a!0";
+		"\u0005\u0007\u0005\u0002\u0006\u0007\u0006\u0001\u0000\u0001\u0000\u0004"+
+		"\u0000\u0011\b\u0000\u000b\u0000\f\u0000\u0012\u0001\u0000\u0001\u0000"+
+		"\u0001\u0001\u0001\u0001\u0003\u0001\u0019\b\u0001\u0001\u0001\u0001\u0001"+
+		"\u0001\u0001\u0003\u0001\u001e\b\u0001\u0001\u0002\u0001\u0002\u0001\u0002"+
+		"\u0005\u0002#\b\u0002\n\u0002\f\u0002&\t\u0002\u0001\u0002\u0001\u0002"+
+		"\u0001\u0003\u0001\u0003\u0001\u0003\u0001\u0003\u0001\u0004\u0001\u0004"+
+		"\u0001\u0004\u0001\u0004\u0001\u0005\u0001\u0005\u0003\u00054\b\u0005"+
+		"\u0001\u0006\u0001\u0006\u0001\u0006\u0003\u00069\b\u0006\u0001\u0006"+
+		"\u0000\u0000\u0007\u0000\u0002\u0004\u0006\b\n\f\u0000\u00009\u0000\u000e"+
+		"\u0001\u0000\u0000\u0000\u0002\u001d\u0001\u0000\u0000\u0000\u0004\u001f"+
+		"\u0001\u0000\u0000\u0000\u0006)\u0001\u0000\u0000\u0000\b-\u0001\u0000"+
+		"\u0000\u0000\n3\u0001\u0000\u0000\u0000\f8\u0001\u0000\u0000\u0000\u000e"+
+		"\u0010\u0005\u0001\u0000\u0000\u000f\u0011\u0003\u0002\u0001\u0000\u0010"+
+		"\u000f\u0001\u0000\u0000\u0000\u0011\u0012\u0001\u0000\u0000\u0000\u0012"+
+		"\u0010\u0001\u0000\u0000\u0000\u0012\u0013\u0001\u0000\u0000\u0000\u0013"+
+		"\u0014\u0001\u0000\u0000\u0000\u0014\u0015\u0005\u0002\u0000\u0000\u0015"+
+		"\u0001\u0001\u0000\u0000\u0000\u0016\u0018\u0003\u0004\u0002\u0000\u0017"+
+		"\u0019\u0003\n\u0005\u0000\u0018\u0017\u0001\u0000\u0000\u0000\u0018\u0019"+
+		"\u0001\u0000\u0000\u0000\u0019\u001a\u0001\u0000\u0000\u0000\u001a\u001b"+
+		"\u0003\u0006\u0003\u0000\u001b\u001e\u0001\u0000\u0000\u0000\u001c\u001e"+
+		"\u0005\u0003\u0000\u0000\u001d\u0016\u0001\u0000\u0000\u0000\u001d\u001c"+
+		"\u0001\u0000\u0000\u0000\u001e\u0003\u0001\u0000\u0000\u0000\u001f \u0005"+
+		"\u0006\u0000\u0000 $\u0005\u000b\u0000\u0000!#\u0003\b\u0004\u0000\"!"+
+		"\u0001\u0000\u0000\u0000#&\u0001\u0000\u0000\u0000$\"\u0001\u0000\u0000"+
+		"\u0000$%\u0001\u0000\u0000\u0000%\'\u0001\u0000\u0000\u0000&$\u0001\u0000"+
+		"\u0000\u0000\'(\u0005\b\u0000\u0000(\u0005\u0001\u0000\u0000\u0000)*\u0005"+
+		"\u0007\u0000\u0000*+\u0005\u000b\u0000\u0000+,\u0005\b\u0000\u0000,\u0007"+
+		"\u0001\u0000\u0000\u0000-.\u0005\u000b\u0000\u0000./\u0005\n\u0000\u0000"+
+		"/0\u0003\f\u0006\u00000\t\u0001\u0000\u0000\u000014\u0003\u0002\u0001"+
+		"\u000024\u0005\f\u0000\u000031\u0001\u0000\u0000\u000032\u0001\u0000\u0000"+
+		"\u00004\u000b\u0001\u0000\u0000\u000059\u0005\f\u0000\u000067\u0005\r"+
+		"\u0000\u000079\u0005\u0004\u0000\u000085\u0001\u0000\u0000\u000086\u0001"+
+		"\u0000\u0000\u00009\r\u0001\u0000\u0000\u0000\u0006\u0012\u0018\u001d"+
+		"$38";
 	public static final ATN _ATN =
 		new ATNDeserializer().deserialize(_serializedATN.toCharArray());
 	static {
diff --git a/src/main/java/controlP5/layout/lang/XMLVisitor.java b/src/main/java/controlP5/layout/lang/XMLVisitor.java
new file mode 100644
index 0000000..4b8fd76
--- /dev/null
+++ b/src/main/java/controlP5/layout/lang/XMLVisitor.java
@@ -0,0 +1,55 @@
+// Generated from XML.g4 by ANTLR 4.13.0
+package controlP5.layout.lang;
+import org.antlr.v4.runtime.tree.ParseTreeVisitor;
+
+/**
+ * This interface defines a complete generic visitor for a parse tree produced
+ * by {@link XMLParser}.
+ *
+ * @param <T> The return type of the visit operation. Use {@link Void} for
+ * operations with no return type.
+ */
+public interface XMLVisitor<T> extends ParseTreeVisitor<T> {
+	/**
+	 * Visit a parse tree produced by {@link XMLParser#document}.
+	 * @param ctx the parse tree
+	 * @return the visitor result
+	 */
+	T visitDocument(XMLParser.DocumentContext ctx);
+	/**
+	 * Visit a parse tree produced by {@link XMLParser#element}.
+	 * @param ctx the parse tree
+	 * @return the visitor result
+	 */
+	T visitElement(XMLParser.ElementContext ctx);
+	/**
+	 * Visit a parse tree produced by {@link XMLParser#startTag}.
+	 * @param ctx the parse tree
+	 * @return the visitor result
+	 */
+	T visitStartTag(XMLParser.StartTagContext ctx);
+	/**
+	 * Visit a parse tree produced by {@link XMLParser#endTag}.
+	 * @param ctx the parse tree
+	 * @return the visitor result
+	 */
+	T visitEndTag(XMLParser.EndTagContext ctx);
+	/**
+	 * Visit a parse tree produced by {@link XMLParser#attribute}.
+	 * @param ctx the parse tree
+	 * @return the visitor result
+	 */
+	T visitAttribute(XMLParser.AttributeContext ctx);
+	/**
+	 * Visit a parse tree produced by {@link XMLParser#content}.
+	 * @param ctx the parse tree
+	 * @return the visitor result
+	 */
+	T visitContent(XMLParser.ContentContext ctx);
+	/**
+	 * Visit a parse tree produced by {@link XMLParser#value}.
+	 * @param ctx the parse tree
+	 * @return the visitor result
+	 */
+	T visitValue(XMLParser.ValueContext ctx);
+}
\ No newline at end of file
diff --git a/src/test/java/LayoutTests.java b/src/test/java/LayoutTests.java
new file mode 100644
index 0000000..c6a302a
--- /dev/null
+++ b/src/test/java/LayoutTests.java
@@ -0,0 +1,2 @@
+package PACKAGE_NAME;public class LayoutTests {
+}