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| <h1 class="topictitle1">Adding entries to the XML Catalog</h1> |
| |
| |
| |
| |
| <div><p>An XML Catalog entry contains two parts - a Key (which represents |
| a DTD or XML schema) and a Location (similar to a URI, which contains information |
| about a DTD or XML schema's location). You can place the Key in an XML file. |
| When the XML processor encounters it, it will use the XML Catalog entry to |
| find the location of the DTD or XML schema associated with the Key</p> |
| |
| <div class="section"><p>XML Catalog entries can be used in various situations. For example, |
| you are working on an XML file on your main desktop computer and point its <samp class="codeph">schemaLocation</samp> towards |
| a schema called <samp class="codeph">c:\MySchema.xsd</samp>. You then save it to your |
| laptop computer so you can work on it later. When you open the file on your |
| laptop, however, you encounter a problem - the XML editor cannot find the <samp class="codeph">MySchema.xsd</samp> schema |
| because it is actually installed on your D drive. You will have to edit the <samp class="codeph">schemaLocation</samp> to |
| point to <samp class="codeph">d:\MySchema.xsd</samp>. When you have finished editing |
| the XML file and are ready to publish it on the Web, you will need to edit |
| the URI again so that it points to a resource that is accessible on the Web. |
| By now, the problem is obvious. A URI used within an XML file is not as portable |
| as you would like it to be. To avoid making frequent changes to your XML document, |
| you can use the XML Catalog.</p> |
| <p>An XML Catalog entry is used by an XML |
| processor when resolving entity references. You can provide rules to the catalog |
| to specify how entities should be resolved. If you consider the preceding |
| example, you could specify a rule that redirects an Internet resource reference |
| (for example, <samp class="codeph">"http://www.ibm.com/published-schemas/MySchema.xsd"</samp>) |
| so that it points to a resource on the developer's local machine (for example, |
| <samp class="codeph">"file:///C:/MySchema.xsd"</samp>). Now, instead of frequently editing |
| XML documents to update the URIs or locations (especially when there are many |
| documents in your project), you only need to update a single rule in your |
| XML Catalog.</p> |
| <p>The following instructions were written for the Resource |
| perspective, but they will also work in many other perspectives.</p> |
| <p>To |
| add an entry to the XML Catalog, follow these steps:</p> |
| </div> |
| |
| <ol> |
| <li class="stepexpand"><span>Open the XML file that you want to associate with a DTD or XML |
| schema.</span></li> |
| |
| <li class="stepexpand"><span>Click <span class="menucascade"><span class="uicontrol">Window</span> > <span class="uicontrol">Preferences</span> |
| </span> and select <span class="menucascade"><span class="uicontrol">XML</span> > <span class="uicontrol">XML |
| Catalog</span></span>.</span> The <span class="uicontrol">XML Catalog |
| Entries</span> section contains a list of any user-defined and plug-in |
| defined catalog entries. Select any entry to see information about it in the <span class="uicontrol">Details</span> section. |
| </li> |
| |
| <li class="stepexpand"><span>Click <span class="uicontrol">Add</span> to create a new catalog entry.</span> |
| </li> |
| |
| <li class="stepexpand"><span>In the <span class="uicontrol">Location</span> field, enter or browse for |
| the location or URI of the DTD or XML schema file. This uses your computer's |
| path style to describe the location of the file.</span></li> |
| |
| <li class="stepexpand"><span>Select a key type for the catalog entry from the <span class="uicontrol">Key |
| Type</span> drop down.</span> The values in this list will change |
| depending on the type of file you specified in the <span class="uicontrol">Location</span> field:<ul> |
| <li>If you specified a DTD: select <span class="uicontrol">Public ID</span>, <span class="uicontrol">System |
| ID</span>, or <span class="uicontrol">URI</span> from the <span class="uicontrol">Key Type</span> field. |
| If you select <span class="uicontrol">Public ID,</span> the value you enter in the <span class="uicontrol">Key</span> field |
| should be the same as the Public ID in the XML file's DOCTYPE declaration. |
| If you select <span class="uicontrol">System ID</span>, the value you enter should |
| correspond to the System ID in an XML file's DOCTYPE declaration. If you select <span class="uicontrol">URI</span>, |
| the value you enter must be a fully qualified URI.</li> |
| |
| <li>If you specified an XML schema: select either <span class="uicontrol">Namespace Name</span> or |
| <span class="uicontrol">Schema Location</span> from the <span class="uicontrol">Key Type</span> field. |
| If the schema defines a target namespace, it will automatically appear in |
| the <span class="uicontrol">Key</span> field. Otherwise, you can enter the schema |
| location in the <span class="uicontrol">Key</span> field.</li> |
| |
| </ul> |
| </li> |
| |
| <li class="stepexpand"><span>Select the <span class="uicontrol">Specify alternative Web address</span> check |
| box if you want to be able to specify an alternate Web address for the resource.</span> |
| This Web address is used when an XML instance is generated from this |
| catalog entry.<div class="note"><span class="notetitle">Note:</span> This option is only available if you select <span class="uicontrol">Public |
| ID</span> (for a DTD) or <span class="uicontrol">Namespace Name</span> (for |
| a schema) in the <span class="uicontrol">Key type</span> field.</div> |
| </li> |
| |
| <li class="stepexpand"><span>If you want to refer to another catalog without importing it into |
| the workbench, click <span class="uicontrol">Next Catalog</span>. Type or browse for |
| the XML catalog you want to refer to. </span></li> |
| |
| <li class="stepexpand"><span>When you are done creating catalog entries, click <span class="uicontrol">OK</span> to |
| close the Add XML Catalog Entry dialog. Click <span class="uicontrol">OK</span> again |
| to save your settings.</span></li> |
| |
| <li class="stepexpand"><span>Make sure the XML file is in focus and click the <span class="uicontrol">Reload |
| dependencies</span> toolbar button. </span></li> |
| |
| </ol> |
| |
| <div class="section">The XML file is now associated with the latest version of the XML |
| schema or DTD.</div> |
| |
| <div class="section"><p>You can also export and import XML Catalog information: </p> |
| <p>To |
| export, click <span class="uicontrol">File > Export</span> and select <span class="uicontrol">XML |
| > XML Catalog</span>. You will be prompted to select a project and provide |
| a file name to store your catalog entries in an .xmlcatalog file, which can |
| be opened from the Navigator view. Since your catalog entries are stored in |
| an .xmlcatalog file, you can check them in and out and share them like any |
| other project resource.</p> |
| <p>To import, click <span class="uicontrol">File > Import</span> and |
| select <span class="uicontrol">XML > XML Catalog</span>. Then specify the file that |
| will be used to load the XML Catalog settings. When you import a .xmlcatalog |
| file, any entries in it will be loaded into the XML Catalog (and any existing |
| entries will be overwritten). </p> |
| </div> |
| |
| </div> |
| |
| <div><div class="relconcepts"><strong>Related concepts</strong><br /> |
| <div><a href="../topics/cxmlcat.html" title="When an XML file is associated with a DTD or XML schema, it is bound by any structural rules contained in the DTD or XML schema. To be considered a valid XML file, a document must be accompanied by a DTD or an XML schema, and conform to all of the declarations in the DTD or the XML schema.">XML file associations with DTDs and XML schemas</a></div> |
| </div> |
| <div class="reltasks"><strong>Related tasks</strong><br /> |
| <div><a href="../topics/tedtcnst.html" title="In the Design view, when you edit an XML file that has a set of constraints or 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.">Editing with DTD or XML schema constraints</a></div> |
| <div><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 DOCTYPE declarations</a></div> |
| <div><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. The changes will be reflected in the guided editing mechanisms available in the editor, such as content assist.">Updating XML files with changes made to DTDs and schemas</a></div> |
| <div><a href="../topics/tedtsch.html" title="Your namespace information is used to provide various information about the XML file, such as the XML schema and namespace it is associated with. If desired, you can change the schema and namespace your XML file is associated with or add a new association. Modifying any associations can impact what content is allowed in the XML file.">Editing namespace information</a></div> |
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