This HTML5 document contains 4 embedded RDF statements represented using HTML+Microdata notation.

The embedded RDF content will be recognized by any processor of HTML5 Microdata.

PrefixNamespace IRI
isaphttp://webisa.webdatacommons.org/prov/
isahttp://webisa.webdatacommons.org/
n5sitepoint.
rdfhttp://www.w3.org/1999/02/22-rdf-syntax-ns#
provhttp://www.w3.org/ns/prov#
xsdhhttp://www.w3.org/2001/XMLSchema#
Subject Item
isa:54175463
rdf:type
prov:Entity
prov:value
And second, there is no such thing as a penalty for duplicate content.Regarding the question of whether you should use a sub-domain or a separate domain, my advice would be to do whatever your visitors are likely to find more convenient (I suspect that, in practice, it will not make much difference, but you know your visitors better than I do).
prov:wasQuotedFrom
n5:com
Subject Item
isap:32126565
prov:wasDerivedFrom
isa:54175463