I've written a blog post about a new Wikibase PHP library that was released recently. It contains a short overview of the rationale behind the component, as well as some words on how it can be useful to people working with Wikibase.

http://www.bn2vs.com/blog/2015/08/11/wikibase-datamodel-services/

Cheers

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Jeroen De Dauw - http://www.bn2vs.com