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| <h1 xmlns:l="http://docbook.sourceforge.net/xmlns/l10n/1.0">Overview</h1> |
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| <h2 class="title"> |
| <a name="Overview"></a>Overview</h2> |
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| <span class="section"><a href="Overview.html#WhatisQVTd">What is QVT Declarative?</a></span> |
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| <span class="section"><a href="Overview.html#WhatisQVTd">Syntax Clarification</a></span> |
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| <div class="section" title="What is QVT Declarative?"> |
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| <h2><a name="WhatisQVTd"></a>What is QVT Declarative?</h2> |
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| <p> |
| The QVT Declarative Project provides the Eclipse implementations of the OMG QVT Core and Relations languages. |
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| (The QVT Operational project provides the QVT Operational language.) |
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| <h2><a name="Syntax"></a>Syntax Clarification</h2> |
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| <p> |
| The Core and Relations languages require an additional import statement to bind the metamodel name to an external package. |
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| <pre> |
| import SimpleUML : 'SimpleUml.ecore'::umlMM; |
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| specifies that a metamodel will be obtained from the SimpleUml.ecore file and then navigating from the document root |
| to the nested element named umlMM, which should be a package. The referenced package is then associated with the SimpleUML |
| metamodel identifier. |
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| import SimpleUML : 'SimpleUml.ecore#/'; |
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| specifies that a metamodel will be obtained from the SimpleUml.ecore file and then navigating |
| to the / fragment id, which should be a package. The referenced package is then associated with the SimpleUML |
| metamodel identifier. |
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| <h3>QVT core middle metamodel</h3> |
| The middle metamodel is the unnamed metamodel used in where clauses. This may be bound to an external metamodel by an anonymous import. |
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| import SimpleUML : 'SimpleUml.ecore'::umlMM; |
| import SimpleUMLtoRDBMS : 'SimpleUMLtoRDBMS.ecore'::uml2rdbms; |
| import SimpleRDBMS : 'SimpleRdbms.ecore'::rdbmsMM; |
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| transformation umlRdbms { |
| uml imports SimpleUML; |
| rdbms imports SimpleRDBMS; |
| imports SimpleUMLtoRDBMS; |
| } |
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