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Java 9 platform changes

The new XML Catalog API, delivered with Java 9, follows the OASIS XML Catalogs standard, v1.1. Here are the feature and capability highlights:

Implements EntityResolver
Implements URIResolver
Creation of XML Catalogs is possible via the CatalogManager
CatalogManager will be used to create CatalogResolvers
OASIS open catalog file semantics will be followed
- Map an external identifier to a URI reference
- Map a URI reference to another URI reference
CatalogResolvers will implement the JAXP EntityResolver interface
CatalogResolvers will implement the JAXP URIResolver interface
The SAX XMLFilter will be supported by the resolver.

Since the new XML Catalog API will be public, the pre-Java 9 internal catalog resolver will ...

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