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| <title>Referential integrity</title> |
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| <body id="rrefintg"><a name="rrefintg"><!-- --></a> <h1 class="topictitle1">Referential |
| integrity in the XML schema editor</h1> <div><p>The XML schema editor has |
| a built-in mechanism to handle referential integrity issues. When you delete |
| certain nodes, clean up for any nodes affected will automatically occur.</p> <div><p>When |
| you define a complex type, you can add a content model to it and reference |
| a global element. </p><div class="skipspace"><div class="p">For example:<pre><schema> |
| <element name="comment" type="string"> |
| <complexType name="Items"> |
| <sequence> |
| <element ref="comment"> |
| </sequence> |
| </complexType> |
| </schema></pre> </div> <p>If the global element (comment) was deleted, |
| all references to it would be in error. However, when you delete the global |
| element, the XML schema editor will clean up using the following algorithm:</p> <ul> |
| <li>If there are one or more global elements in the schema, it will change |
| all existing references to the first global element.</li> |
| <li>If there is no global element, then it will delete the element reference |
| from the content model.</li> |
| </ul> </div> <div class="section"><h4 class="sectiontitle">Deleting included |
| and imported schema</h4><div class="p">If an included or imported schema is |
| deleted, you must manually reset the following type references as appropriate: <ul> |
| <li>Global element and element's type</li> |
| <li>Attribute type</li> |
| <li>Complex type derivation</li> |
| <li>Simple type derivation</li> |
| </ul> They will not automatically be reset if an included or imported schema |
| is deleted.</div> </div> </div> <p><div class="relconcepts"><strong>Related |
| concepts</strong><br/> <div><a href="../topics/cxmlsced.html" title="XML schemas are an XML language for describing and constraining the content of XML files." |
| >XML schema editor</a></div> </div></p> <p class="reltasks"><strong>Related |
| tasks</strong><br/> <div><a href="../topics/tedtschm.html" title="After you create an XML schema, you can edit its various properties, such as its namespace and prefix." |
| >Editing XML schema properties</a></div> </p></div> <p></p></body> |
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