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Type relational algebra model (fork of ertes-ag's relational)

ertes-ag's relational

Begun 'minus'. ertes-m Thu Sep 18 11:09:36 UTC 2014
Added Compat. ertes-m Thu Sep 18 09:50:06 UTC 2014
Added cross product. ertes-m Thu Sep 18 09:43:15 UTC 2014
Added intersection. ertes-m Thu Sep 18 09:02:43 UTC 2014
Separated field predicate and field type, finished selection and projection, added union. ertes-m Thu Sep 18 08:51:53 UTC 2014
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