ActiveFacts provides a semantic modeling language, the Constellation Query Language (CQL). CQL combines natural language verbalisation and formal logic, producing a formal language that reads like plain English. ActiveFacts converts semantic models from CQL to relational and object models in SQL, Ruby and other languages.
The generated models are guaranteed congruent, which eliminates the object-relational impedance mismatch. Semantic models are much more stable under evolving requirements than either relational or object-oriented models, because they directly express the underlying elementary facts, so are not susceptible to ramifying change in the way those attribute-oriented approaches are.
Semantic modeling is a refinement of fact-based modeling techniques such as ORM2, NIAM and others. ActiveFacts can convert ORM2 files from NORMA to CQL. Fact-based modeling is closely related to relational modeling in the sixth normal form, but doesn't suffer from 6NF inefficiency. The relational models it derives are highly efficient.
afgen --sql/server myfile.cql afgen --ruby myfile.cql afgen --cql myfile.orm
sudo gem install activefacts
* Queries are parsed, but not yet generated to SQL. * The Constellation API lacks SQL persistence (but is already useful; the CQL compiler uses the generated Ruby code extensively) * Validation of semantic models is incomplete
Treetop parser generator
NORMA (see <www.ormfoundation.org/files/>), if you want to use ORM (needs Visual Studio Pro edition)
Copyright © 2008 Clifford Heath.
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