Bug 187201 DTE should give out 4 API for CrossTab sort and filter
DTE should give out 4 API for CrossTab sort and filter. 2 apis are used by giving out the available binding for CrossTab sort and filter. The third is api used by giving out the member value viewer is available. The fourth api is used by giving out the available value list about the memeber value.
data/org.eclipse.birt.report.data.adapter/src/org/eclipse/birt/report/data/adapter/api/DataRequestSession.java
* this session must have been initialized with a valid ReportDesignHandle
	 * which contains the named data set
	 * 
	 * @param dataSetName
	 *            name of data set
	 * @param useCache
	 *            If true, this method may return metadata cached in the report
	 *            design.If the cached metadata is empty then return an empty 
	 *            IResultMetaData instance. If the ReportDesignHandle does not 
	 *            have cached metadata then return null.
	 */
	public abstract IResultMetaData getDataSetMetaData( String dataSetName,
			boolean useCache ) throws BirtException;
	/**
	 * Obtains the metadata of a data set given its model handle.
	 * 
	 * @param dataSetHandle
	 *            data set handle
	 * @param useCache
	 *            If true, this method may return metadata cached in the report
	 *            design.If the cached metadata is empty then return an empty 
	 *            IResultMetaData instance. If the ReportDesignHandle does not 
	 *            have cached metadata then return null.
	 *		  	            
	 */
	public abstract IResultMetaData getDataSetMetaData(
			DataSetHandle dataSetHandle, boolean useCache )
			throws BirtException;
	
	/**