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| <h1 xmlns:l="http://docbook.sourceforge.net/xmlns/l10n/1.0">How Does It Work?</h1> | |
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| <a name="HowDoesItWork"></a>How Does It Work?</h2> | |
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| <p>QVTr and QVTc are programming languages, so you will want to edit them, execute them and debug them.</p> | |
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| <a name="Editing"></a>Editing</h3> | |
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| <p>Eclipse QVTd provides QVTr, QVTc and QVTi editors developed using Xtext. The QVTc editor may be used to view or maintain the intermediate QVTu, QVTm and QVTp models.</p> | |
| <p>The editor may be opened conventionally by double clicking a *.qvtr, *.qvtc, or *.qvti text file name in an Explorer view. This displays the source text with syntax highlighting and an outline of the Abstract Syntax.</p> | |
| <p>The QVTc and QVTi editors may also be used to view *.qvtcas and *.qvtias XMI files as source text. </p> | |
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| <a name="Status"></a>Status</h4> | |
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| <p>These editors have been available since QVTd 0.9.0. They are useful, but currently have only limited well-formedness validation.</p> | |
| <p>Editing *.qvtcas and *.qvtias files should be possible but is not recommended in the current release.</p> | |
| <p>Hopefully 1.0.0 (Oxygen) will offer UMLX as a graphical alternative to the QVTr textual exposition of a transformation.</p> | |
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| <a name="Execution"></a>Execution</h3> | |
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| <p>The 0.13.0 release provides one QVTr and one QVTc example project that be installed and executed. However execution functionality is very new and not suitable for more than experimental use.</p> | |
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| <a name="Status2"></a>Status</h4> | |
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| <p>QVTi execution has been available since 0.11.0 (Luna). It demonstrates the extensibility of the Eclipse OCL interpreter, Java code generator and debugger. QVTi is a low level intermediate; it is not intended as a primary programming language.</p> | |
| <p>A very preliminary form of QVTc execution was available in 0.12.0 (Mars) using an Epsilon prototype of the transformation chain.</p> | |
| <p>0.13.0 (Neon) introduces a Java re-implementation of the full transformation chain so that QVTr and QVTc transformations can be executed. It is only suitable for researchers.</p> | |
| <p>The current execution supports only creation of output models. Checking, updated, incremental, in-place execution and views are work in progress.</p> | |
| <p>Hopefully 1.0.0 (Oxygen) will have more substantial functionality and will be used internally to replace some of the manual Java transformations by QVTr / UMLX transformations.</p> | |
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| <div class="section" title="Debugger"> | |
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| <a name="Debugger"></a>Debugger</h3> | |
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| <p>The QVTi debugger extends the OCL debugger.</p> | |
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| <a name="Status3"></a>Status</h4> | |
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| <p>The further extension to provide QVTc and QVTr debugging is work in progress.</p> | |
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