Open Graph protocol library for Java

I wasn't that impressed with the Java offerings out there that I could find for the Open Graph protocol.

• opengraph-java the toXHTML function fails., there are no tests
• open-graph-java Empty!
• og4j - I like that it handles multiples as per the specification (see this test for example).

I need to investigate these, could they have some shareable libraries?

• neo4j
• reco4j

Unsatisfied, I started a project at github: ogp-java. It does not handle multiple fields yet (2 image tags for instance).