Adds an attribute object of owner to the attribute class className in the root's ClassMap.
public PdfAttributeObject AddClassAttributes(CosName className, CosName owner)
The class name, which elements name in their C entry (AddClassName(CosName)).
The attribute owner, such as Layout.
ISO 32000-2 Table 354 (ClassMap), §14.7.6.2. A class with several attribute objects holds an array of them.