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/api/elements/DesignChoiceConstants.java
*/
	public static final String CHOICE_FORMAT_TYPE = "formatType"; 
	public static final String FORMAT_TYPE_ALL = "all"; 
	public static final String FORMAT_TYPE_VIEWER = "viewer"; 
	public static final String FORMAT_TYPE_EMAIL = "email"; 
	public static final String FORMAT_TYPE_PRINT = "print"; 
	public static final String FORMAT_TYPE_PDF = "pdf"; 
	public static final String FORMAT_TYPE_RTF = "rtf"; 
	public static final String FORMAT_TYPE_REPORTLET = "reportlet"; 
	public static final String FORMAT_TYPE_EXCEL = "excel"; 
	public static final String FORMAT_TYPE_WORD = "word"; 
	public static final String FORMAT_TYPE_POWERPOINT = "powerpoint"; 
	/**
	 * ImageRefType -- The image reference type. The first constant is the name
	 * of ImageRefType choice. The followed constants are valid choice values of
	 * ImageRefType.
	 */
	public static final String CHOICE_IMAGE_REF_TYPE = "imageRefType"; 
	public static final String IMAGE_REF_TYPE_NONE = "none"; 
	public static final String IMAGE_REF_TYPE_FILE = "file"; 
	public static final String IMAGE_REF_TYPE_URL = "url"; 
	public static final String IMAGE_REF_TYPE_EXPR = "expr"; 
	public static final String IMAGE_REF_TYPE_EMBED = "embed"; 
	/**
	 * propertyMaskType -- The choice for the property mask. The first constant
	 * is the name of propertyMaskType choice. The followed constants are valid
	 * choice values of propertyMaskType.
	 */
	public static final String CHOICE_PROPERTY_MASK_TYPE = "propertyMaskType"; 
	public static final String PROPERTY_MASK_TYPE_CHANGE = "change";