8.10.3 EntityResolver Objects 
  | resolveEntity( | 
  publicId, systemId) | 
 
- 
  Resolve the system identifier of an entity and return either the
  system identifier to read from as a string, or an InputSource to
  read from. The default implementation returns systemId.
 
Release 2.5.4, documentation updated on 23rd December, 2008.
 
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