This is root element of this document which contains name space definitions for the document elements. It's a referenced element. For detailed description, please refer referenced element doc. Description is not available. The unique number which identifies the subclass. The number of the class which contains the subclass. This value must be predefined on the CLASS table. The number of the department which contains the subclass. This value must be predefined on the DEPS table. Provide an extension hook to customize XMrchHrSclsRef. This type can hold a string of max length of 4 characters. This type can hold a number of digits count 4. This type can hold a string of max length of 7 characters.