XML Catalog Preferences

To configure the XML Catalog options, open the Preferences dialog box and go to XML > XML Catalog.

The following options are available:

Prefer - the prefer setting determines whether public identifiers specified in the catalog are used in favor of system identifiers supplied in the document. Suppose you have an entity in your document for which both a public identifier and a system identifier has been specified, and the catalog only contains a mapping for the public identifier (for example, a matching public catalog entry). If public is selected, the URI supplied in the matching public catalog entry is used. If system is selected, the system identifier in the document is used.
Note: If the catalog contained a matching system catalog entry giving a mapping for the system identifier, that mapping would have been used, the public identifier would never have been considered, and the setting of override would have been irrelevant.
Generally, the purpose of catalogs is to override the system identifiers in XML documents, so Prefer should usually be public in your catalogs.
When using catalogs it is sometimes useful to see what catalog files are parsed, if they are valid or not, and what identifiers are resolved by the catalogs. The Verbosity option selects the detail level of such logging messages of the XML catalog resolver that will be displayed in the Catalogs view at the bottom of the window:
- None - No message is displayed by the catalog resolver when it tries to resolve a URI reference, a SYSTEM one or a PUBLIC one with the XML catalogs specified in this panel.
- Unresolved entities - Only the logging messages that track the failed attempts to resolve references are displayed.
- All messages - The messages of both failed attempts and successful ones are displayed.
If Resolve schema locations also through system mappings is enabled, Oxygen XML Editor analyzes both uri and system mappings in order to resolve the location of schema.
Note: This option is not applicable for DTD schemas since the public and system catalog mappings are always considered.
If Process namespaces through URI mappings for XML Schema is selected then the target namespace of the imported XML Schemas is resolved through the uri mappings. The namespace is taken into account only when the schema specified in the schemaLocation attribute was not resolved successfully.
If the Use default catalog option is checked the first XML catalog which Oxygen XML Editor will use to resolve references at document validation and transformation will be a default built-in catalog. This catalog maps such references to the built-in local copies of the schemas of the Oxygen XML Editor frameworks (DocBook, DITA, TEI, XHTML, SVG, etc.)

You can also add or configure catalogs at framework level from the Catalogs tab in the Document Type configuration dialog box.

When you add, delete or edit an XML catalog to / from the list, reopen the currently edited files which use the modified catalog or run the Validate action so that the XML catalog changes take full effect.