I also looked for something like this for a while. Rikaki was about it, but I still did not have time to really look at him. Here are some of the answers I received from Faro and Musa.
http://lists.gforge.inria.fr/pipermail/pharo-project/2012-February/059235.html As of 2012-02-07
I am not aware of RDF support in Pharo. But it would be great to have it, especially in the context of Musa. If Rakayko has it, I will be interested. Let us know what you find.
As for XML, XMLSupport is a more mature solution. PetitXml is good because it is based on PetitParser, which is the central parser in Moose, so in the long run I would prefer to use this one. But support libraries, such as XPath, or support for factory objects, are not yet available. - Tudor Girba
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