Add functions for finding entry headers
Add functions for finding entry headers

Signed-off-by: Robert D Anderson <4907d442684b61876fae0471c4d2d08024a9ca72@us.ibm.com>

shaneataylor/dita-ot,drmacro/dita-ot,dita-ot/dita-ot,dita-ot/dita-ot,infotexture/dita-ot,dita-ot/dita-ot,infotexture/dita-ot,infotexture/dita-ot,shaneataylor/dita-ot,dita-ot/dita-ot,dita-ot/dita-ot,drmacro/dita-ot,shaneataylor/dita-ot,infotexture/dita-ot,drmacro/dita-ot,infotexture/dita-ot,drmacro/dita-ot,shaneataylor/dita-ot,shaneataylor/dita-ot,drmacro/dita-ot