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| <title>Adding elements</title> |
| </head> |
| <body id="taddelm"><a name="taddelm"><!-- --></a> <h1 class="topictitle1">Adding |
| elements</h1> <div><p>Elements are fundamental building blocks in XML. Element |
| declarations provide value constraints, and a description that can be used |
| for validation, as well as establishing constraining relationships between |
| related elements and attributes, and controlling substitution of elements.</p><div |
| class="skipspace"><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, 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 <b> <span class="uicontrol">Add Element</span></b>.</span></li> |
| <li class="skipspace"><span>In the Properties view, type a new name for the |
| element in the <b> <span class="uicontrol">Name</span></b> field.</span></li> |
| <li class="skipspace"><span>Specify its type information by clicking the <b> <span |
| class="uicontrol">Browse</span></b> button <img border="0" height="18" src="../images/Browse.gif" |
| width="22"/> and selecting the appropriate type.</span> The Set Type dialog |
| lists all built-in and user-defined types currently available. You can change |
| the <b><span class="uicontrol">Scope</span></b> of the list by selecting |
| one of the following options: <div> <ul> |
| <li><b><span class="uicontrol">Workspace</span></b>. Lists all of the types |
| available in your workspace. </li> |
| <li><b><span class="uicontrol">Enclosing Project</span></b>. Lists all |
| of the types available in the project that contains your file. </li> |
| <li>(Default) <b><span class="uicontrol">Current Resource</span>. </b> List |
| all of the types available in your current file. </li> |
| </ul> </div> </li> |
| <li class="skipspace"><span>(Optional) Select the appropriate value in the <b> <span |
| class="uicontrol">MinOccurs</span></b> field.</span> This is the number of |
| times the element may appear. If you want the element to be optional, select <b><span |
| class="uicontrol">0</span></b>. Otherwise, select <b><span class="uicontrol">1</span></b>. </li> |
| <li class="skipspace"><span>(Optional) Select the appropriate value in the <b> <span |
| class="uicontrol">MaxOccurs</span></b> field.</span> This is the maximum number |
| of times the element may appear. You can select <b> <span class="uicontrol">unbounded</span></b> to |
| indicate there is no maximum number of occurrences.</li> |
| <li class="skipspace"> <div> (Optional) Click the <b><span class="uicontrol">Other</span></b> tab. |
| In this page, you can specify the following various values for the element: |
| <ul> |
| <li><b><span class="uicontrol">block</span></b>. This field determines |
| whether the element may be replaced by an element derived from it. </li> |
| <li><b><span class="uicontrol">fixed/default</span>.</b> Click the <b> <span |
| class="uicontrol">Browse</span></b> button <img border="0" height="18" src="../images/Browse.gif" |
| width="22"/> and select the <b><span class="uicontrol">Fixed</span></b> or <b> |
| <span class="uicontrol">Default</span></b> radio button and specify an |
| appropriate value. If you select <strong>Fixed</strong>, the element has |
| a fixed value, which cannot be changed. If you select <strong>Default</strong>, |
| the element has a default value. </li> |
| <li><b><span class="uicontrol">form</span></b>. Use this field to indicate |
| if the appearance of this element in an instance of the XML schema (that |
| is, an XML file associated with the XML schema) must be qualified by a |
| namespace. </li> |
| <li><b><span class="uicontrol">maxOccurs</span></b>. This is the minimum |
| number of times the element can appear in an instance document. You can |
| specify this option here or in the General page. </li> |
| <li><b><span class="uicontrol">minOccurs</span></b>. This is the maximum |
| number of times the element can appear in an instance document. You can |
| specify this option here or in the General page. </li> |
| <li><b><span class="uicontrol">nillable</span></b>. Select <strong>true</strong> |
| if you do not want the element to be able to have any child elements, |
| only attributes. </li> |
| </ul> </div> </li> |
| <li class="skipspace"><span>Click the <b> <span class="uicontrol">Attributes</span></b> 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.</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<b> <span class="uicontrol">Add Attribute</span>.</b></span> You |
| can specify the following values for an attribute<ul> |
| <li><b><span class="uicontrol">fixed/default</span>.</b> Click the <b> <span |
| class="uicontrol">Browse</span></b> button <img border="0" height="18" src="../images/Browse.gif" |
| width="22"/> and select the <b> <span class="uicontrol">Fixed</span></b> or <b> <span |
| class="uicontrol">Default</span></b> 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><b><span class="uicontrol">form</span></b>. 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><b><span class="uicontrol">name</span></b>. Enter the name of the attribute.</li> |
| <li><b><span class="uicontrol">type</span></b>. Click the <b> <span class="uicontrol">Browse</span></b> button <img |
| border="0" height="18" src="../images/Browse.gif" width="22"/> and select |
| the type of the attribute. </li> |
| <li><b><span class="uicontrol">use</span></b>. 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 <b> <span class="uicontrol">Add Attribute Ref</span></b>.</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"> <b>ref</b></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 <b> <span class="uicontrol">Add Attribute Group |
| Ref</span>.</b></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"> <b>ref</b></span> drop down |
| list.</span></li> |
| </ol> </li> |
| <li class="skipspace"><span>An <samp class="codeph">any</samp> element enables |
| element content according to namespaces, and the corresponding <samp class="codeph">any</samp> attribute |
| element enables attributes to appear in elements. To add an <samp class="codeph">any</samp> attribute, |
| right-click in the Attributes page and click <b> <span class="uicontrol">Add |
| Any Attribute</span>.</b></span> You can specify the following values for |
| an <samp class="codeph">any</samp> attribute:<ul> |
| <li>For a <strong>namespace</strong> value, you can select <strong>##any</strong> (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 <b> <span class="uicontrol">processContents</span></b> 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 <b> <span class="uicontrol">Documentation</span></b> tab |
| if you want to provide any information about this element.</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 class="skipspace">You can add a content model to an element, which |
| is the representation of any data that may be contained inside the element. |
| For more information about working with content models, refer to the related |
| tasks.</div> </div> <div><p><b class="reltaskshd">Related tasks</b><br/> <a |
| href="../topics/taddcmod.html" title="You can add a content model to an element, global element, a complex type, or a group. A content model is the representation of any data that may be contained inside the element, global element, complex type, or group." |
| >Adding a content model</a><br/> </p> </div> </body> |
| </html> |
