The classification infobar loads the classification value from the
document metadata. In order to add metadata to a document from the UI,
it's necessary to know what are the possible choices. Those choices can
be described in an XML file. The format of that XML is described using
this XSD schema. baf.xsd is the main file from
<https://www.tscp.org/wp-content/uploads/2013/08/TSCP_BAFv1.pdf>, the
rest are just the dependencies.

Change-Id: I6b22c0279031799cafa4fd6edd20ed1cdb09c8cc