Bug 136279 Structure and table datatypes should be hidden.
Description: Structure and table datatype should be hidden. Steps to reproduce: In table data binding, I saw structure and table two datatypes. They are not supported now, so they should be removed.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/parser/StructureState.java
if ( tagName.equalsIgnoreCase( DesignSchemaConstants.TEXT_PROPERTY_TAG ) )
			return new TextPropertyState( handler, element, struct );
		if ( tagName.equalsIgnoreCase( DesignSchemaConstants.HTML_PROPERTY_TAG ) )
			return new TextPropertyState( handler, element, struct );
		if ( tagName.equalsIgnoreCase( DesignSchemaConstants.STRUCTURE_TAG ) )
			return new StructureState( handler, element, propDefn, struct );
		return super.startElement( tagName );
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.report.model.util.AbstractParseState#end()
	 */
	public void end( ) throws SAXException
	{
		if ( struct != null )
		{
			if ( parentStruct != null )
			{
				parentStruct.setProperty( propDefn, struct );
			}
			else if ( list != null )
			{
				
				list.add( struct );
			}
			else
			{
				
				element.setProperty( name, struct );