Update yang Makefile.
Add file for capabilities of external modules.
Update Makefile to add external capabilities.
Add hello-external.ent as dependency.
Add .gitignore files
Add Makefile target for rnc.
Add stylesheet for adding date and revision.
Add stylesheet for compiling references.
Clean up Makefiles.
Improve the upd-i-d stylesheet.
Improve clean target.
Add DTD.
Update Makefiles.
Fix typo.
Add entity-based parts of the DTD.
Supply DTD on xml2rfc command line.
Update Makefile in figures/.
Remove directory in external entities.
Get rid of subdirectories.
Move the module to the main directory.