Bug 197589 Need constant for automaic attribute name "DateTime"
Currently when set dateTimeLevelType for cube level, model will automatically create a built-in attribute "DateTime". But the name is hard-coded. We need a public constant for this name to allow UI to access it.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/api/elements/structures/LevelAttribute.java
* dictionary.
	 */
	public static final String STRUCTURE_NAME = "LevelAttribute"; 
	/**
	 * Name of the column name member.
	 */
	public static final String NAME_MEMBER = "name"; 
	/**
	 * Name of the data type member.
	 */
	public static final String DATA_TYPE_MEMBER = "dataType"; 
	/**
	 * The column name.
	 */
	private String name = null;
	/**
	 * The data type of this column.
	 */
	private String dataType = null;
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.report.model.core.IStructure#getStructName()
	 */
	public String getStructName( )
	{
		return STRUCTURE_NAME;
	}
	/*
	 * (non-Javadoc)