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<b:Sources SelectedStyle="" xmlns:b="http://schemas.openxmlformats.org/officeDocument/2006/bibliography"  xmlns="http://schemas.openxmlformats.org/officeDocument/2006/bibliography" >
<b:Source>
<b:Tag>brucker.ea:hol-ocl-book:2006</b:Tag>
<b:SourceType>Report</b:SourceType>
<b:Publisher>ETH Zurich</b:Publisher>
<b:Year>2006</b:Year>
<b:Issue>525</b:Issue>
<b:Author>
<b:Author><b:NameList>
<b:Person><b:Last>Brucker</b:Last><b:First>Achim</b:First><b:Middle>D</b:Middle></b:Person>
<b:Person><b:Last>Wolff</b:Last><b:First>Burkhart</b:First></b:Person>
</b:NameList></b:Author>
</b:Author>
<b:Title>The HOL-OCL Book</b:Title>
<b:Comments>HOL-OCL is an interactive proof environment for the Object Constraint Language (OCL). It is implemented as a shallow embedding of OCL into the Higher-order Logic (HOL) instance of the interactive theorem prover Isabelle. HOL-OCL defines a machine-checked formalization of the semantics as described in the standard for OCL 2.0. This conservative, shallow embedding of UML/OCL into Isabelle/HOL includes support for typed, extensible UML data models supporting inheritance and subtyping inside the typed lambda-calculus with parametric polymorphism. As a consequence of conservativity with respect to higher-order logic (HOL), we can guarantee the consistency of the semantic model. Moreover, HOL-OCL provides several derived calculi for UML/OCL that allow for formal derivations establishing the validity of UML/OCL formulae. Elementary automated support for such proofs is also provided top </b:Comments>
</b:Source>
</b:Sources>