Reference level attribute

The referenceLevel attribute is an attribute extension for attribute elements in OXML, which allows defining a reference level for an attribute. The following reference levels can be defined:

byValue - direct or embedded value (default)

byReference - reference attribute in the sense of C++ (&, transient required)

byPointer - pointer attribute in the sense of C++ (*, transient required)

byPointerPointer - pointer attribute in the sense of C++ (**, transient required)

generic - generic attribute (persistent required)