| <?xml version="1.0" encoding="UTF-8"?> |
| <!DOCTYPE html |
| PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> |
| <html> |
| <head> |
| <!-- /******************************************************************************* |
| * Copyright (c) 2000, 2005 IBM Corporation and others. |
| * All rights reserved. This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License v1.0 |
| * which accompanies this distribution, and is available at |
| * http://www.eclipse.org/legal/epl-v10.html |
| * |
| * Contributors: |
| * IBM Corporation - initial API and implementation |
| *******************************************************************************/ --> |
| <link rel="stylesheet" type="text/css" href="../../org.eclipse.wst.doc.user/common.css" /> |
| <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">More</span></b> button |
| <img border="0" src="../images/More.gif" width="22" height="18"> 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">More</span></b> button |
| <img border="0" src="../images/More.gif" width="22" height="18"> 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">More</span></b> button |
| <img border="0" src="../images/More.gif" width="22" height="18"> 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">More</span></b> button |
| <img border="0" src="../images/More.gif" width="22" height="18"> 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> |