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| <title>Adding an element reference</title> |
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| <h1 class="topictitle1">Adding an element reference</h1> |
| <div><p>An element reference provides a reference to a global element. |
| A declaration that references a global element enables the referenced global |
| element to appear in the instance document in the context of the referencing |
| declaration. </p><div class="skipspace">The menu option to add an element reference only appears if there |
| are global elements defined elsewhere in the document.<p>The following instructions |
| were written for the Resource perspective, but they will also work in many |
| other perspectives. </p> |
| <p>To add an element reference, follow these |
| steps:</p> |
| </div> |
| <ol><li class="skipspace"><span>In the Outline view, right-click the content model you want to |
| work with and click <span class="uicontrol">Add Element Ref</span>.</span></li> |
| <li class="skipspace"><span>Select the element reference.</span></li> |
| <li class="skipspace"><span>In the Properties view, select the global element you want to reference |
| in the <span class="uicontrol">ref</span> list.</span></li> |
| <li class="skipspace"><span>(Optional) Select the appropriate value in the <span class="uicontrol">MinOccurs</span> field.</span> This is the number of times the global element referenced may appear. |
| If you want the element to be optional, select <span class="uicontrol">0</span>. Otherwise, |
| select <span class="uicontrol">1</span>. </li> |
| <li class="skipspace"><span>(Optional) Select the appropriate value in the <span class="uicontrol">MaxOccurs</span> field.</span> This is the maximum number of times the global element referenced may |
| appear. You can select <span class="uicontrol">unbounded</span> to indicate there |
| is no maximum number of occurrences.</li> |
| <li class="skipspace"><span>(Optional) Click the <span class="uicontrol">Other</span> tab. </span> In this page, you can specify various values for thel element reference, |
| such as <span class="uicontrol">abstract</span>, <span class="uicontrol">block</span>, <span class="uicontrol">final</span>, <span class="uicontrol">fixed/default</span>, <span class="uicontrol">nillable</span>, and <span class="uicontrol">substituionGroup</span>.</li> |
| <li class="skipspace"><span>Click the <span class="uicontrol">Attributes</span> tab</span> You |
| can use this page to add attributes, attribute references, attributes group |
| references, and <samp class="codeph">any</samp> attributes to your element reference.</li> |
| <li class="skipspace"><span>An attribute associates an attribute name with a specific type |
| and value. To add an attribute, right-click in the Attributes page, and click <span class="uicontrol">Add |
| Attribute</span>.</span> You can specify the following values for |
| an attribute<ul><li><span class="uicontrol">fixed/default</span>. Click the <span class="uicontrol">More</span> button |
| and select the <span class="uicontrol">Fixed</span> or <span class="uicontrol">Default</span> radio |
| button and specify an appropriate value. If you select <b>Fixed</b>, the attribute |
| has a fixed value, which cannot be changed. If you select <b>Default</b>, |
| the attribute has a default value.</li> |
| <li><span class="uicontrol">form</span>. Use this field to indicate if the appearance |
| of this attribute in an instance of the XML schema must be qualified by a |
| namespace.</li> |
| <li><span class="uicontrol">name</span>. Enter the name of the attribute.</li> |
| <li><span class="uicontrol">type</span>. Click the <span class="uicontrol">More</span> button |
| and select the type of the attribute. </li> |
| <li><span class="uicontrol">use</span>. This field indicates how an attribute |
| may be used in an instance document. If you select <b>optional</b>, the attribute |
| may appear once, but it does not have to. If you select <b>required</b>, the |
| attribute must appear once. If you select <b>prohibited</b>, the attribute |
| must not appear. <b>Note</b>: If you selected the <span class="uicontrol">Default</span> radio |
| button, you must select <b>optional</b> in this field, otherwise the default |
| value will not be valid.</li> |
| </ul> |
| </li> |
| <li class="skipspace"><span>An attribute reference provides a reference to a global attribute. |
| To add an attribute reference, right-click in the Attributes page, and click <span class="uicontrol">Add |
| Attribute Ref</span>.</span> A declaration that references a global |
| attribute enables the referenced attribute to appear in the instance document |
| in the context of the referencing declaration. The menu option to add |
| an attribute reference only appears if there are global attributes defined |
| elsewhere in the document.<ol type="a"><li><span>Select the reference, then select the global attribute you want |
| it to reference from the <span class="uicontrol">ref</span> drop down list.</span></li> |
| </ol> |
| </li> |
| <li class="skipspace"><span>An attribute group reference provides a reference to an attribute |
| group. To add an attribute group reference, right-click in the Attributes |
| page, and click <span class="uicontrol">Add Attribute Group Ref</span>.</span> A |
| declaration that references an attribute group enables the referenced attribute |
| group to appear in the instance document in the context of the referencing |
| declaration. The menu option to add an attribute group reference only appears |
| if there are attribute groups defined elsewhere in the document.<ol type="a"><li><span>Select the reference, then select the attribute group you want |
| it to reference from the <span class="uicontrol">ref</span> drop down list.</span></li> |
| </ol> |
| </li> |
| <li class="skipspace"><span>An <samp class="codeph">any</samp> element enables attributes to appear |
| in <samp class="codeph">any</samp> elements. To add an <samp class="codeph">any</samp> attribute, |
| right-click in the Attributes page, and click <span class="uicontrol">Add Any Attribute</span>.</span> You can specify the following values for an <samp class="codeph">any</samp> attribute:<ul><li>For a <b>namespace</b> value, you can select <b>##any</b> (this allows |
| any well-formed XML from any namespace), <b>##local </b> (this allows any |
| well-formed XML that is not declared to be in a namespace, <b>##other </b> (this |
| allows any well-formed XML that is not from the target namespace of the type |
| being defined) or <b>##targetNamespace </b> (which is shorthand for the target |
| namespace of the type being defined). </li> |
| <li>For a <span class="uicontrol">processContents</span> value, you can select <b>skip</b> (the |
| XML processor will not validate the attribute content at all), <b>lax</b>(the |
| XML processor will validate the attribute content as much as it can), or <b>strict </b> (the |
| XML processor will validate all the attribute content).</li> |
| </ul> |
| </li> |
| <li class="skipspace"><span>Click the <span class="uicontrol">Documentation</span> tab if you want |
| to provide any information about this element reference.</span> The <span class="uicontrol">Documentation</span> page is used for human readable |
| material, such as a description, and the <span class="uicontrol">App Info</span> page |
| can be used to provide information for applications. </li> |
| </ol> |
| </div> |
| |
| <div><p><b class="reltaskshd">Related tasks</b><br /> |
| <a href="../topics/taddglem.html" title="A global element is an element with a global scope. It is one that has been declared as part of the main schema rather than as part of a complex type definition.">Adding a global element</a><br /> |
| </p> |
| </div> |
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