Note that this handler and the Unparsed handler above overlap. If both are set, then this handler will not be called for unparsed entities. The element handler is called when an element declaration is found. The Elname parameter is the name of the element with which the attribute is being associated. The Attname parameter is the name of the attribute.
Type is the attribute type, given as a string.
If Fixed is true, then this is a fixed attribute. Name is the document type name. Internal is the internal subset, given as a string. If there was no internal subset, it will be undefined. Internal will contain all whitespace, comments, processing instructions, and declarations seen in the internal subset.