Arbortext adding @xmlns:atgra to all xref and link elements, and DITA OT rejects it

Hi, all...

Our upgraded Arbortext 6.0 M050 editor is now inserting thexmlns:atgra attribute into all <link> and <xref> elements, and the DITA OT errors out on it saying that it must be defined. We're using vanilla out-of-the-box DITA topics, and no customizations to AT, the DTDs, or the OT (yet).

How do we prevent AT from adding this attribute, or what do we have to do to get the OT to accept it? Prefer eliminating it.

Thanks

Steve Fogel, Information Architect, Oracle Database, Oracle Corporation