| <html><head><META http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><title>5.8.4. Constrained Variable List</title><link href="style.css" rel="stylesheet" type="text/css"><meta content="DocBook XSL Stylesheets V1.72.0" name="generator"><link rel="start" href="index.html" title="The VIATRA2 Model Transformation Framework"><link rel="up" href="sec_Parameters.html" title="5.8. Parameters and Variable Lists"><link rel="prev" href="def_ActualParameter.html" title="5.8.3. Actual Parameters"><link rel="next" href="sec_VTCLTokens.html" title="6. Tokens in the VTCL Language"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table summary="Navigation header" width="100%"><tr><th align="center" colspan="3">5.8.4. Constrained Variable List</th></tr><tr><td align="left" width="20%"><a accesskey="p" href="def_ActualParameter.html">Prev</a> </td><th align="center" width="60%">5.8. Parameters and Variable Lists</th><td align="right" width="20%"> <a accesskey="n" href="sec_VTCLTokens.html">Next</a></td></tr></table><hr></div><div class="sect3" lang="en"><div class="titlepage"><div><div><h4 class="title"><a name="def_ConstrainedVariableList"></a>5.8.4. Constrained Variable List</h4></div></div></div><div class="tip" style="margin-left: 0.5in; margin-right: 0.5in;"><table border="0" summary="Tip: Description"><tr><td valign="top" align="center" rowspan="2" width="25"><img alt="[Tip]" src="images/tip.png"></td><th align="left"><a name="def_ConstrainedVariableList_Description"></a>Description</th></tr><tr><td valign="top" align="left"><p> | |
| A <span class="strong"><strong>constrained variable list</strong></span> | |
| <a name="N130D6" class="indexterm"></a> | |
| is a list of variables where the | |
| variables are placeholders for model elements. The possible values of these variables | |
| are restricted by <a href="def_ContainmentConstraint.html" title="2.1.9. Containment Constraint">containment constraints</a>, | |
| to certain locations in the containment hierarchy of the model space. | |
| </p></td></tr></table></div><div class="important" style="margin-left: 0.5in; margin-right: 0.5in;"><table border="0" summary="Important: Syntax"><tr><td valign="top" align="center" rowspan="2" width="25"><img alt="[Important]" src="images/important.png"></td><th align="left"><a name="def_ConstrainedVariableList_Syntax"></a>Syntax</th></tr><tr><td valign="top" align="left"><pre class="programlisting"> | |
| ConstrainedVariablesOptAST ::= $empty | |
| | ConstrainedVariablesAST | |
| ConstrainedVariablesAST ::= <a href="def_Variable.html" title="5.7.2. Variable">VariableDefAST</a> <a href="def_ContainmentConstraint.html" title="2.1.9. Containment Constraint">ContainmentConstraintOptAST</a> | |
| | ConstrainedVariablesAST COMMA <a href="def_Variable.html" title="5.7.2. Variable">VariableDefAST</a> <a href="def_ContainmentConstraint.html" title="2.1.9. Containment Constraint">ContainmentConstraintOptAST</a> | |
| </pre></td></tr></table></div><div class="note" style="margin-left: 0.5in; margin-right: 0.5in;"><table border="0" summary="Note: Semantics"><tr><td valign="top" align="center" rowspan="2" width="25"><img alt="[Note]" src="images/note.png"></td><th align="left"><a name="def_ConstrainedVariableList_Semantics"></a>Semantics</th></tr><tr><td valign="top" align="left"><p> | |
| <span class="strong"><strong>Constrained variable lists</strong></span> are used in a | |
| <a href="def_ChooseRule.html" title="4.3.6. Choose Rule">choose rule</a> or in a <a href="def_ForallRule.html" title="4.3.7. Forall Rule">forall rule</a>, | |
| where the list of variables are quantified existentially or universally, respectively. | |
| These variables can store only model elements and the <a href="def_ContainmentConstraint.html" title="2.1.9. Containment Constraint">containment constraint</a> | |
| restricts the possible location of model elements with respect to their location in the containment hierarchy. | |
| </p></td></tr></table></div><div class="highlights"><a name="def_ConstrainedVariableList_UsedBy"></a><p><b>Used By: </b> | |
| <a href="def_ChooseRule.html" title="4.3.6. Choose Rule">choose rule</a>, | |
| <a href="def_ForallRule.html" title="4.3.7. Forall Rule">forall rule</a> | |
| </p></div><div class="highlights"><a name="def_ConstrainedVariableList_SeeAlso"></a><p><b>See Also: </b> | |
| <a href="def_ContainmentConstraint.html" title="2.1.9. Containment Constraint">containment constraint</a>, | |
| </p></div></div><div class="navfooter"><hr><table summary="Navigation footer" width="100%"><tr><td align="left" width="40%"><a accesskey="p" href="def_ActualParameter.html">Prev</a> </td><td align="center" width="20%"><a accesskey="u" href="sec_Parameters.html">Up</a></td><td align="right" width="40%"> <a accesskey="n" href="sec_VTCLTokens.html">Next</a></td></tr><tr><td valign="top" align="left" width="40%">5.8.3. Actual Parameters </td><td align="center" width="20%"><a accesskey="h" href="index.html">Home</a></td><td valign="top" align="right" width="40%"> 6. Tokens in the VTCL Language</td></tr></table></div></body></html> |