Met with PAB and made these changes:

• Moved the XML source link down to the bottom of the document metadata field list.
• Added handling for Research Notes (stored in <notesStmt> in the <teiHeader>).
• Added more sophisticated handling for the <ref> tag so that one item can link directly to another in this wise:

    <ref target="Nks1867-098v.xml"></ref>
  

  while preserving the normal functionality for external links.