Introduce Item#type, returning a simple item type string identifier.

src/item/Group.js

@@ -24,6 +24,8 @@
  * @extends Item
  */
 var Group = this.Group = Item.extend(/** @lends Group# */{
+	_type: 'group',
+
 	// DOCS: document new Group(item, item...);
 	/**
 	 * Creates a new Group item and places it at the top of the active layer.

src/item/Item.js

@@ -176,6 +176,17 @@ var Item = this.Item = Base.extend(Callback, /** @lends Item# */{
 		return this._id;
 	},
 
+	/**
+	 * The type of the item as a string.
+	 *
+	 * @type String('group', 'layer', 'path', 'compoundpath', 'raster',
+	 * 'placedsymbol', 'pointtext')
+	 * @bean
+	 */
+	getType: function() {
+		return this._type;
+	},
+
 	/**
 	 * The name of the item. If the item has a name, it can be accessed by name
 	 * through its parent's children list.

src/item/Layer.js

@@ -27,6 +27,7 @@
  * @extends Group
  */
 var Layer = this.Layer = Group.extend(/** @lends Layer# */{
+	_type: 'layer',
 	// DOCS: improve constructor code example.
 	/**
 	 * Creates a new Layer item and places it at the end of the

src/item/PlacedSymbol.js

@@ -23,6 +23,7 @@
  * @extends PlacedItem
  */
 var PlacedSymbol = this.PlacedSymbol = PlacedItem.extend(/** @lends PlacedSymbol# */{
+	_type: 'placedsymbol',
 	/**
 	 * Creates a new PlacedSymbol Item.
 	 *

src/item/Raster.js

@@ -22,6 +22,7 @@
  * @extends PlacedItem
  */
 var Raster = this.Raster = PlacedItem.extend(/** @lends Raster# */{
+	_type: 'raster',
 	// Raster doesn't make the distinction between the different bounds,
 	// so use the same name for all of them
 	_boundsType: 'bounds',

src/path/CompoundPath.js

@@ -25,6 +25,7 @@
  * @extends PathItem
  */
 var CompoundPath = this.CompoundPath = PathItem.extend(/** @lends CompoundPath# */{
+	_type: 'compoundpath',
 	/**
 	 * Creates a new compound path item and places it in the active layer.
 	 *

src/path/Path.js

@@ -23,6 +23,7 @@
  */
 // DOCS: Explain that path matrix is always applied with each transformation.
 var Path = this.Path = PathItem.extend(/** @lends Path# */{
+	_type: 'path',
 	/**
 	 * Creates a new Path item and places it at the top of the active layer.
 	 *

src/text/PointText.js

@@ -24,6 +24,7 @@
  * @extends TextItem
  */
 var PointText = this.PointText = TextItem.extend(/** @lends PointText# */{
+	_type: 'pointtext',
 	/**
 	 * Creates a point text item
 	 *