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| <h1 class="topictitle1">Editing with DTD or XML schema constraints</h1> |
| <div><p>In the Design view, when you edit an XML file that has a set of |
| constraints (that is, a set of rules) defined by a DTD or an XML schema, you |
| can turn the constraints on and off to provide flexibility in the way you |
| edit, but still maintain the validity of the document periodically.</p><div class="skipspace"><p> When the constraints are turned on, and you are working in the |
| Design view, the XML editor prevents you from inserting elements, attributes, |
| or attribute values not permitted by the rules of the XML schema or DTD, and |
| from removing necessary or predefined sets of tags and values. In this mode, |
| an element's content must be valid to use the XML editor's guided editing |
| options.</p> |
| <p>You may want to turn the constraints off for an XML file if |
| you need more flexibility. For example, you want to try working with elements |
| or attributes not permitted by the associated DTD or XML schema, without actually |
| removing the association with the DTD or XML schema.</p> |
| <p>To turn the constraints |
| for an XML file off, click <span class="uicontrol">XML > Turn Grammar Constraints Off</span>. |
| After you have turned the constraints off for a file, you can insert or delete |
| any element or attribute regardless of the DTD or XML schema rules. You can |
| create new elements or attributes that are not in the DTD or schema - these |
| Design view prompts will only appear when you have turned constraints off. |
| The file may not be valid, however, if you do this. </p> |
| <p>The following instructions |
| were written for the Resource perspective, but they will also work in many |
| other perspectives.</p> |
| <p>The following is an example of what you can do if |
| you turn the constraints of a DTD off:</p> |
| </div> |
| <ol><li class="skipspace"><span>Open the XML file in the XML editor (right-click the file in the |
| Navigator view and click <span class="uicontrol">Open With > XML Editor</span>). </span></li> |
| <li class="skipspace"><span>For example, you have a DTD that specifies that an element requires |
| at least one of a specific child element: </span> <pre><!ELEMENT parentElement (childElement+)></pre> |
| </li> |
| <li class="skipspace"><span>If, in an XML file associated with your DTD, you attempt to remove |
| the final child element of the element with the DTD constraints turned on, |
| the editor will not allow you to do this, as it will make the document invalid.</span> You can confirm this by using the element's pop-up menu to verify that |
| the<span class="uicontrol">Remove</span> option is grayed out.</li> |
| <li class="skipspace"><span>To turn the DTD constraints off, click <span class="uicontrol">XML > Turn Grammar |
| Constraints Off</span>. </span></li> |
| <li class="skipspace"><span>If you attempt to remove the same child element with constraints |
| off, the editor will allow you to.</span></li> |
| <li class="skipspace"><span>To correct the invalid document, you will have to re-add the necessary |
| element, or remove the invalid tagging or value.</span></li> |
| </ol> |
| <div class="skipspace">If you introduce errors into your files, you must save and validate |
| the file in order to see a list of the errors you have introduced. They will |
| be listed in the Problems view. After you fix the errors, you must save and |
| validate your file again to see if the file is now valid.</div> |
| </div> |
| |
| <div> |
| |
| <p><b class="relconceptshd">Related concepts</b><br /> |
| <a href="../topics/cxmlcat.html" title="There are two different ways to associate XML files with DTDs or XML schemas.">XML file associations with DTDs and XML schemas</a><br /> |
| </p> |
| <p><b class="reltaskshd">Related tasks</b><br /> |
| <a href="../topics/tedtdoc.html" title="The DOCTYPE declaration in an XML file is used at the beginning of it to associate it with a DTD file. You can edit your DOCTYPE declaration to change the DTD file your XML file is associated with.">Editing your DOCTYPE declaration</a><br /> |
| <a href="../topics/txmlcat.html" title="Adding an entry to the XML Catalog"></a><br /> |
| <a href="../topics/tedtgram.html" title="If you make changes to a DTD file or XML schema associated with an XML file (that is currently open), click XML > Reload Dependencies to update the XML file with these changes.">Updating XML files with changes made to DTDs and schemas</a><br /> |
| <a href="../topics/tedtsch.html" title="Your namespace information is used to provide various information about the XML file, such as the XML schema it is associated with. ">Editing your namespace information</a><br /> |
| </p> |
| </div><p> |
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