add rdfa property to uri references
fix html syntax
Add back test that doesn't need to be skipped anymore
add dependency on semargl for rdfa parsing in tests
add ignored failing test that attempts to parse page as RDFa, but
currently fails
Fix RDFa parsing, in particular ensure that we always have a base URI,
as semargl relies on the base URI being present to generate URIs
Merge branch 'rdfa'