check for a last modified date before using it in caching headers
pre-define the RDF namespace.
handle rdf:type with special mixin logic
add Link[rel=meta] header to content requests
jcr:createdBy is a protected property, and will be auto-populated from the Session attributes
allow fedora:resource to have any type of properties, not just strings
pass in an explicit type when creating jcr properties
pass in a namespace prefix map to the rdf => jcr property translator