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From: bugzilla@apache.org
To: ant-dev@jakarta.apache.org
Cc: 
Subject: DO NOT REPLY [Bug 6495] New:  -
    Support XML catalogs to resolve external entities
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http://nagoya.apache.org/bugzilla/show_bug.cgi?id=6495

Support XML catalogs to resolve external entities

           Summary: Support XML catalogs to resolve external entities
           Product: Ant
           Version: 1.5 alpha (nightly)
          Platform: Other
        OS/Version: Other
            Status: NEW
          Severity: Enhancement
          Priority: Other
         Component: Other
        AssignedTo: ant-dev@jakarta.apache.org
        ReportedBy: nascif@acm.org


It is a common practice to use external XML entities to support re-use
among similar buildfiles.  
One of biggest problems with that practice
is that currently there is no way to specify the 
external entity
location other than using relative paths in the entity URI (for
entities 
residing in the local system).

This restriction could be removed if Ant exposed the Crimsom 
API that
supports the registration of catalogs. This little extension would
eliminate the 
issue of hardcoded relative paths. For example, instead
of:

 <!DOCTYPE project [
     
<!ENTITY common  SYSTEM "file:./../../../../common.xml"
 ]

 We would be able to use:

 
<!ENTITY common
          PUBLIC "-//mycompany//loadbuild-common-code//EN"
          "common.xml"

 The 
PUBLIC name could be used to obtain the URI from a catalog
provided to Ant at launch time. Ant 
would just have to allow the user
to register mappings for public names (i.e. the XML catalog); 
for
example, passing a file in the command line or specifying it in an
environment variable 
(ANT_CATALOG?).

 This is the method I'm talking about, from class
 
org.apache.crimson.parser.Resolver:

     /**
      * Registers the given public ID as 
corresponding to a particular
      * URI, typically a local copy.  This URI will be used in 
preference
      * to ones provided as system IDs in XML entity declarations.  This
      * mechanism 
would most typically be used for Document Type Definitions
      * (DTDs), where the public IDs are 
formally managed and versioned.
      *
      * @param publicId The managed public ID being mapped
      * 
@param uri The URI of the preferred copy of that entity
      */
     public void registerCatalogEntry 
(

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