XML::LibXML::Dtd(3) User Contributed Perl Documentation XML::LibXML::Dtd(3)

# [NAME](#NAME)

XML::LibXML::Dtd - XML::LibXML DTD Handling

# [SYNOPSIS](#SYNOPSIS)

```
  use XML::LibXML;
  $dtd = XML::LibXML::Dtd->new($public_id, $system_id);
  $dtd = XML::LibXML::Dtd->parse_string($dtd_str);
  $publicId = $dtd->getName();
  $publicId = $dtd->publicId();
  $systemId = $dtd->systemId();
```

# [DESCRIPTION](#DESCRIPTION)

This class holds a DTD. You may parse a DTD from either a string, or from an external SYSTEM identifier.

No support is available as yet for parsing from a filehandle.

XML::LibXML::Dtd is a sub-class of XML::LibXML::Node, so all the methods available to nodes (particularly **toString()**) are available to Dtd objects.

# [METHODS](#METHODS)

[new](#new)

```
  $dtd = XML::LibXML::Dtd->new($public_id, $system_id);
    
```

Parse a DTD from the system identifier, and return a DTD object that you can pass to $doc->**is\_valid()** or $doc->**validate()**.

```
  my $dtd = XML::LibXML::Dtd->new(
                        "SOME // Public / ID / 1.0",
                        "test.dtd"
                                  );
   my $doc = XML::LibXML->new->parse_file("test.xml");
   $doc->validate($dtd);
    
```

[parse\_string](#parse_string)

```
  $dtd = XML::LibXML::Dtd->parse_string($dtd_str);
    
```

The same as **new()** above, except you can parse a DTD from a string. Note that parsing from string may fail if the DTD contains external parametric-entity references with relative URLs.

[getName](#getName)

```
  $publicId = $dtd->getName();
    
```

Returns the name of DTD; i.e., the name immediately following the DOCTYPE keyword.

[publicId](#publicId)

```
  $publicId = $dtd->publicId();
    
```

Returns the public identifier of the external subset.

[systemId](#systemId)

```
  $systemId = $dtd->systemId();
    
```

Returns the system identifier of the external subset.

# [AUTHORS](#AUTHORS)

Matt Sergeant, Christian Glahn, Petr Pajas

# [VERSION](#VERSION)

2.0212

# [COPYRIGHT](#COPYRIGHT)

2001-2007, AxKit.com Ltd.

2002-2006, Christian Glahn.

2006-2009, Petr Pajas.

# [LICENSE](#LICENSE)

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

2026-10-30 perl v5.44.0

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Document: XML::LibXML::Dtd(3pm) from perl-xml-libxml 2.0212-r4 (Chainguard OS)
Source: https://github.com/shlomif/perl-XML-LibXML