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| <meta name="DC.Title" content="Referential integrity in the XML schema editor" /> |
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| <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 class="section">When you define a complex type, you can add a content model to it |
| and reference a global element. <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> |
| |
| <div><div class="relconcepts"><strong>Related concepts</strong><br /> |
| <div><a href="../topics/cxmlsced.html" title="This product provides an XML schema editor for creating, viewing, and validating XML schemas. XML schemas are a formal specification of element names that indicates which elements are allowed in an XML file, and in which combinations.">XML schema editor</a></div> |
| </div> |
| <div 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> |
| <div><a href="../topics/tdelscmp.html" title="If you have created any XML schema components you no longer need, you can delete them.">Deleting XML schema components</a></div> |
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