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Create a document about the implementation of Data types.

Questions that the document needs to answer:
* how are data types represented? how are they shown on the wiki? how are they maintained?
* how can data types be extended?
* how are they translated?
* take into account at least the list of data types from the data model. Think for example about unit conversion. Where will units and conversions be defined and maintained?
* check and compare with how SMW does it, might prove very useful input.
* composite types? intervals? (rf to IntervalSnaks and Geocoordinates)
* rendering, serialization, editing -- where are they located in the code? how does the architecture look like for this?