7.3 Entity Resolver

An entity resolver may
- Map a public ID to a local file name.
- Produce the data
The interface EntityResolver introduces the following method for handling external entities.
- InputSource resolveEntity(String publicId, String systemId)
A returned value of ‘null’ requests the default behavior
The interface XMLReader provides the following method for registering EntityResolver objects with the XML reader.
- void setEntityResolver(EntityResolver resolver)

class MyEntityResolver implements EntityResolver {
   public InputSource resolveEntity (
                       String publicId, String systemId) {
     if(  publicId.equals("resolve.dtd")
       || systemId.equals("resolve.dtd")  ){
              String url = "sys-resolve.dtd" ;
              return new InputSource( url );
     } else { return null; }
   }
}

-_-_-

<?xml version="1.0"?>
<!DOCTYPE resolve SYSTEM "resolve.dtd" >
<resolve/>

sys-resolve.dtd:

<!ENTITY resolve EMPTY >

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