* [DH_AGENT_CREATE,FIX] Use existing library for asserting datatypes properly.
* [DH_AGENT_PROPERTY,FIX] Dynamic predicates cannot perform automatic RDF prefix expansion.
* [DH_AGENT_PROPERTY,FIX] dho:graph and dho:thread are xsd:anyURI, not plain RDF IRIs.
* [DH_AGENT_PROPERTY,FIX] dho:age required an xsd:dateTime value to be parsed.
* [AH_AGING,DH_CYCLE,DH_ENTAILEMNT,DH_NAV,DH_SEARCH,FIX] Agent properties were not using IRIs yet.