update xmlmap descriptors to work when accessed directly through host class (instead of through an instance) to make sphinx happy
update xmlmap descriptors to work when accessed directly through host class (instead of through an instance) to make sphinx happy

git-svn-id: bb2ed31f08aebe2c251d311350391bbcccfc1c3a@95 1168706f-7e1d-44e7-b746-9e172b5a9a2f

emory-libraries/eulcore-history,emory-libraries/eulcore-history