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 <h1 class="topictitle1">Adding redefine elements</h1>


 <div><p>You can use the <samp class="codeph">redefine</samp> mechanism to
 redefine simple and complex types, groups, and attribute groups obtained
 from external schema files. When you redefine a component, you are
 modifying its contents.</p>

 <div class="section"><p>Like the <samp class="codeph">include</samp> mechanism, <samp class="codeph">redefine</samp> requires
 the external components to be in the same target namespace as the
 redefining schema, although external components from schemas that
 have no namespace can also be redefined.</p>
 <p>The following instructions
 were written for the Resource perspective, but they will also work
 in many other perspectives.</p>
 <p>To add a redefine element, complete
 the following steps:</p>
 </div>

 <ol>
 <li><span>Open your XML schema in the XML schema editor.</span></li>

 <li><span>In the Design view, right-click in the <strong>Directives</strong> section
 and click <span class="uicontrol">Add Redefine</span>.</span></li>

 <li><span>In the Select XML schema file wizard, you can import an
 XML schema that is located in your workspace or you can import a schema
 from an HTTP Web address. The XML schema file that you select must
 have the same namespace as the current schema.</span>
 <ul>
 <li>If you want to import an XML schema located in your workspace:<ol type="a">
 <li>Select <span class="uicontrol">Workbench projects</span> and click <span class="uicontrol">Next</span>. </li>

 <li>Select the schema that you want to import and click <span class="uicontrol">Finish</span>.</li>

 </ol>
 </li>

 <li>If you want to import an XML schema located at an HTTP Web
 address:<ol type="a">
 <li>Select <span class="uicontrol">HTTP</span> and click <span class="uicontrol">Next</span>.</li>

 <li>Type the URL of the XML schema and click <span class="uicontrol">Finish</span>.<div class="note"><span class="notetitle">Note:</span> A
 local copy of the schema is not stored in your workspace. If you validate
 your schema, the schema's contents are checked from the URL that you
 specify.</div>
 </li>

 </ol>
 </li>

 </ul>

 </li>

 <li><strong>Optional: </strong><span>Use the Properties view to define
 additional properties for your import element.</span>
 <ol type="a">
 <li class="substepexpand"><span>If you want to edit the location of the included XML
 schema file, click the <span class="uicontrol">General</span> tab and type
 the new location display in the <span class="uicontrol">Schema location</span> field.</span>
 </li>

 <li class="substepexpand"><span>Click the <span class="uicontrol">Documentation</span> tab if
 you want to provide any information about this redefine element. </span>
  The <span class="uicontrol">Documentation</span> page is used for human
 readable material, such as a description.</li>

 <li class="substepexpand"><span>Click the <span class="uicontrol">Extensions</span> tab if you
 want to add application information elements to your annotations of
 schema components. </span> The <span class="uicontrol">Extensions</span> page
 allows you to specify the schema and add XML content to your annotations.
 </li>

 </ol>

 </li>

 </ol>

 <div class="section"><p>Once you have added the redefine element to your XML schema,
 you can redefine any of the simple and complex types, groups, and
 attribute groups in the XML schema you selected in the redefine element. </p>
 </div>

 </div>

 <div><div class="reltasks"><strong>Related tasks</strong><br />
 <div><a href="../topics/taddimpt.html" title="If your schemas are large, you might choose to divide their content among several schema documents to make them easier to maintain, reuse, and read. You can use an import element to bring in definitions and declarations from an imported schema into the current schema.">Adding import elements</a></div>
 <div><a href="../topics/taddincl.html" title="If your schemas are large, you might choose to divide their content among several schema documents to make them easier to maintain, reuse, and read. You can use the include element to bring in definitions and declarations from the included schema into the current schema. The included schema must be in the same target namespace as the including schema.">Adding include elements</a></div>
 </div>
 <div class="relref"><strong>Related reference</strong><br />
 <div><a href="../topics/rnmspc.html" title="An XML namespace is a collection of names, identified by a URI reference, which are used in XML documents as element types and attribute names.">XML namespaces</a></div>
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	<meta content="task" name="DC.Type" />
	<meta name="DC.Title" content="Adding redefine elements" />
	<meta name="abstract" content="You can use the redefine mechanism to redefine simple and complex types, groups, and attribute groups obtained from external schema files. When you redefine a component, you are modifying its contents." />
	<meta name="description" content="You can use the redefine mechanism to redefine simple and complex types, groups, and attribute groups obtained from external schema files. When you redefine a component, you are modifying its contents." />
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	<title>Adding redefine elements</title>
	</head>
	<body id="taddrdfn"><a name="taddrdfn"><!-- --></a>


	<h1 class="topictitle1">Adding redefine elements</h1>




	<div><p>You can use the <samp class="codeph">redefine</samp> mechanism to
	redefine simple and complex types, groups, and attribute groups obtained
	from external schema files. When you redefine a component, you are
	modifying its contents.</p>

	<div class="section"><p>Like the <samp class="codeph">include</samp> mechanism, <samp class="codeph">redefine</samp> requires
	the external components to be in the same target namespace as the
	redefining schema, although external components from schemas that
	have no namespace can also be redefined.</p>
	<p>The following instructions
	were written for the Resource perspective, but they will also work
	in many other perspectives.</p>
	<p>To add a redefine element, complete
	the following steps:</p>
	</div>

	<ol>
	<li><span>Open your XML schema in the XML schema editor.</span></li>

	<li><span>In the Design view, right-click in the <strong>Directives</strong> section
	and click <span class="uicontrol">Add Redefine</span>.</span></li>

	<li><span>In the Select XML schema file wizard, you can import an
	XML schema that is located in your workspace or you can import a schema
	from an HTTP Web address. The XML schema file that you select must
	have the same namespace as the current schema.</span>
	<ul>
	<li>If you want to import an XML schema located in your workspace:<ol type="a">
	<li>Select <span class="uicontrol">Workbench projects</span> and click <span class="uicontrol">Next</span>. </li>

	<li>Select the schema that you want to import and click <span class="uicontrol">Finish</span>.</li>

	</ol>
	</li>

	<li>If you want to import an XML schema located at an HTTP Web
	address:<ol type="a">
	<li>Select <span class="uicontrol">HTTP</span> and click <span class="uicontrol">Next</span>.</li>

	<li>Type the URL of the XML schema and click <span class="uicontrol">Finish</span>.<div class="note"><span class="notetitle">Note:</span> A
	local copy of the schema is not stored in your workspace. If you validate
	your schema, the schema's contents are checked from the URL that you
	specify.</div>
	</li>

	</ol>
	</li>

	</ul>

	</li>

	<li><strong>Optional: </strong><span>Use the Properties view to define
	additional properties for your import element.</span>
	<ol type="a">
	<li class="substepexpand"><span>If you want to edit the location of the included XML
	schema file, click the <span class="uicontrol">General</span> tab and type
	the new location display in the <span class="uicontrol">Schema location</span> field.</span>
	</li>

	<li class="substepexpand"><span>Click the <span class="uicontrol">Documentation</span> tab if
	you want to provide any information about this redefine element. </span>
	The <span class="uicontrol">Documentation</span> page is used for human
	readable material, such as a description.</li>

	<li class="substepexpand"><span>Click the <span class="uicontrol">Extensions</span> tab if you
	want to add application information elements to your annotations of
	schema components. </span> The <span class="uicontrol">Extensions</span> page
	allows you to specify the schema and add XML content to your annotations.
	</li>

	</ol>

	</li>

	</ol>

	<div class="section"><p>Once you have added the redefine element to your XML schema,
	you can redefine any of the simple and complex types, groups, and
	attribute groups in the XML schema you selected in the redefine element. </p>
	</div>

	</div>

	<div><div class="reltasks"><strong>Related tasks</strong><br />
	<div><a href="../topics/taddimpt.html" title="If your schemas are large, you might choose to divide their content among several schema documents to make them easier to maintain, reuse, and read. You can use an import element to bring in definitions and declarations from an imported schema into the current schema.">Adding import elements</a></div>
	<div><a href="../topics/taddincl.html" title="If your schemas are large, you might choose to divide their content among several schema documents to make them easier to maintain, reuse, and read. You can use the include element to bring in definitions and declarations from the included schema into the current schema. The included schema must be in the same target namespace as the including schema.">Adding include elements</a></div>
	</div>
	<div class="relref"><strong>Related reference</strong><br />
	<div><a href="../topics/rnmspc.html" title="An XML namespace is a collection of names, identified by a URI reference, which are used in XML documents as element types and attribute names.">XML namespaces</a></div>
	</div>
	</div>

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