Bug 180089 BIRT model - TOC predefined styles
In ROM we need to support predefined styles for TOC too. This will allow user to easily create a TOC style, by creating one of two styles. Suggestion i have is - TOC ( Applies to all TOC nodes ) - TOC-level1 ( If defined applies to first level toc nodes ) - TOC-level2 ........... - TOC-level5
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/api/TOCHandle.java
* Gets expression of TOC.
	 * 
	 * @return expression of TOC.
	 */
	public String getExpression( )
	{
		return getStringProperty( TOC.TOC_EXPRESSION );
	}
	/**
	 * Sets expression of TOC.
	 * 
	 * @param expression
	 *            expression of TOC
	 * @throws SemanticException
	 *             semantic exception
	 */
	public void setExpression( String expression ) throws SemanticException
	{
		setProperty( TOC.TOC_EXPRESSION, expression );
	}
	/**
	 * Gets style of TOC.
	 * 
	 * @return style name of TOC
	 */
	public String getStyleName( )
	{
		StyleHandle handle = getStyle( );
		if ( handle == null )
			return null;