Bug 161383 Support page-break-inside property on report item
Need support page-break-inside property on report items
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/metadata/ElementDefn.java
* 
	 * @return True if this is an invisible abstract element, false if this is a
	 *         concrete, user-visible element.
	 */
	public boolean isAbstract( )
	{
		return abstractElement;
	}
	/**
	 * Gets the predefined style for this element.
	 * 
	 * @return The predefined style .
	 */
	public String getSelector( )
	{
		return selector;
	}
	/**
	 * Gets the parent element. This is the element that this element extends.
	 * 
	 * @return Returns the parent element.
	 */
	public IElementDefn getParent( )
	{
		return parent;
	}
	/**
	 * Adds the name of a style property that should be made visible to this
	 * element type. Must be done while creating the element type.
	 *