---
name: "XML::Catalog"
section: "3pm"
platform: "linux"
package: "libxml-catalog-perl"
version: "1.03-3"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/XML::Catalog"
---

# XML::Catalog(3pm)

Resolve public identifiers and remap system identifiers

## NAME

XML::Catalog - Resolve public identifiers and remap system identifiers

## SYNOPSIS

```
  use XML::Catalog;
  my $catalog=XML::Catalog->new('/xml/catalog.cat');
  $catalog->add('http://www.w3.org/xcatalog/mastercat.xml');
  my $sysid=$catalog->resolve_public('-//John Cowan//LOC Diacritics');
  my $newsysid=$catalog->remap_system('http://www.w3.org');
  $parser->setHandlers(ExternEnt=>$catalog->get_handler($parser));
```

### Oasis Example

```
  $ perl -e 'use XML::Catalog; \
  $pubid = q|-//OASIS//DTD DocBook XML V4.5//EN|; \
  my $catalog=XML::Catalog->new("/etc/xml/catalog"); \
  print $catalog->resolve_public($pubid), "\n";'
  file:///usr/share/sgml/docbook/xml-dtd-4.5-1.0-51.el6/docbookx.dtd
```

## DESCRIPTION

This module implements draft 0.4 of John Cowan's XML Catalog (formerly  known as XCatalog) proposal  (\<http://www.ccil.org/~cowan/XML/XCatalog.html\>).  Catalogs may be written  in either SOCAT or XML syntax (see the proposal for syntax details);  XML::Catalog will assume SOCAT syntax if the catalog is not in well-formed  XML syntax.

This module, as of 1.0.0, also supports Oasis XML catalogs.

## CONSTRUCTOR

- new(URL \[,URL\]\*)

  Read the catalog identified by URL and return a catalog object  implementing it.  If more than one URL is given, chain the additional  catalogs as extensions to the catalog (they will be searched before  catalogs specified by EXTEND entries).

  All URLs must be absolute.  A URL with no protocol is treated as a  filename.

## METHODS

- add(URL \[,URL\]\*)

  Chain the catalogs identified by the URL(s) to the current catalog.

- resolve\_public(PUBID)

  Translate the public identifier PUBID to a system identifier.  Returns  undef if the identifier could not be translated.

- remap\_system(SYSID)

  Remap the system identifier SYSID as specified by the catalog.  Returns  SYSID unchanged if no remapping was found.

- get\_handler(PARSER)

  Returns a coderef to a resolver suitable for use as the ExternEnt handler  for an XML::Parser object.  The resolver will first attempt to resolve a  public identifier if supplied, and then attempt to remap the resulting  system identifier (or the original system identifier if no public  identifier was supplied).  It will then call the original ExternEnt handler  associated with the parser object.  PARSER is the parser object; it is  needed as an argument in order to obtain the original handler.

- add\_delegate($pubid, $href)

  TBD

- add\_extend($href)

  TBD

- add\_extend\_object($cat, $group )

  TBD

- add\_map($pubid, $href)

  TBD

- add\_remap($sysid, $href)

  TBD

- build($url)

  create new catalog object

- fix\_base($url)

  TBD

- parse

  TBD

- parse\_SOCAT($ct)

  TBD

- parse\_XML($ct)

  TBD

- set\_base($href)

  TBD

## BUGS / TODO

Searching of chained catalogs is not purely depth-first (EXTEND items in a  chained catalog will be searched before EXTEND items in the original  catalog.

Error checking leaves much to be desired.

## AUTHOR

Current Author:

```
        Jeff Fearn E<lt>jfearn@cpan.orgE<gt>.
```

Former Authors:

```
        Eric Bohlman E<lt>ebohlman@netcom.comE<gt>.
```

## COPYRIGHT

Copyright (c) 1999-2000 Eric Bohlman.  All rights reserved. Copyright (c) 2013 Jeff Fearn. All rights reserved.

This program is free software; you can use/modify/redistribute it under the  same terms as Perl itself.