Bug 213126 Add support for DataEngine-leve dataset cache
In many cases the DataEngine-leve dataset cache is useful which ensure that a dataset is executed one time during rendering one report. To support this feature a new dataset property should be added. The Birt customer can choose whether this dataset need to be cached or not by setting the property in deisgn time.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/writer/ModuleWriter.java
writeResouceKey( DesignSchemaConstants.TEXT_PROPERTY_TAG,
					resourceName, xmlKey, xml, false );
		}
	}
	/**
	 * Writes the resource key as CDATA.
	 * 
	 * @param obj
	 *            the design element
	 * @param resourceKey
	 *            the resource key value
	 * @param resourceValue
	 *            the user-visible resource value
	 */
	protected void resourceKeyCDATA( DesignElement obj, String resourceKey,
			String resourceValue )
	{
		resourceKey( obj, resourceKey, resourceValue, true );
	}
	/**
	 * Writes the entry.
	 * 
	 * @param tag
	 *            the tag to write
	 * @param name
	 *            the property name or member name
	 * @param encryptionID
	 * @param value
	 *            the xml value
	 * @param cdata