NAME¶
XML::AutoWriter - DOCTYPE based XML output
SYNOPSIS¶
use XML::Doctype NAME => a, SYSTEM_ID => 'a.dtd' ;
use XML::AutoWriter qw( :all :dtd_tags ) ;
#
# a.dtd contains:
#
# <!ELEMENT a ( b1, b2?, b3* ) >
# <!ATTLIST a aa1 CDATA #REQUIRED >
# <!ELEMENT b1 ( c1 ) >
# <!ELEMENT b2 ( c2 ) >
#
b1 ; # Emits <a><b1>
c2( attr=>"val" ) ; # Emits </b1><b2><c2 attr="val">
endAllTags ; # Emits </c2></b2></a>
## If you've got an XML::Doctype object handy:
use XML::AutoWriter qw( :dtd_tags ), DOCTYPE => $doctype ;
## If you've saved a preparsed DTD as a perl module
use FooML::Doctype::v1_0001 ;
use XML::AutoWriter qw( :dtd_tags ) ;
## Or as a normal perl object:
$writer = XML::AutoWriter->new( ... ) ;
$writer->startTag( 'b1' ) ;
$writer->startTag( 'c2' ) ;
$writer->end ;
STATUS¶
Alpha. Use and patch, don't depend on things not changing drastically.
Many methods supplied by XML::Writer are not yet supplied here.
DESCRIPTION¶
This module subclasses XML::ValidWriter and provides automatic start and end tag
generation, allowing you to emit only the 'important' tags.
See XML::ValidWriter for the details on all functions not documented here.
XML::Writer API compatibility¶
Much of the interface is patterned after XML::Writer so that it can possibly be
used as a drop-in replacement. It will take awhile before this module emulates
enough of XML::Writer to be a drop-in replacement in situations where the more
advanced XML::Writer methods are used.
Automatic start tag creation is done when emitting a start tag that is not
allowed to be a child of the currently open tag but is allowed to be contained
in the currently open tag's subset. In this case, the minimal number of start
tags necessary to allow All start tags between the current tag and the desired
tag are automatically emitted with no attributes.
If start tag autogeneration fails, then end tag autogeneration is attempted.
startTag() scans the stack of currently open tags trying to close as
few as possible before start tag autogeneration suceeds.
Explicit end tags may be emitted to prevent unwanted automatic start tags, and,
in the future, warnings or errors will be available in place of automatic
start and end tag creation.
METHODS AND FUNCTIONS¶
All of the routines in this module can be called as either functions or methods
unless otherwise noted.
To call these routines as functions use either the DOCTYPE or :dtd_tags options
in the parameters to the use statement:
use XML::AutoWriter DOCTYPE => XML::Doctype->new( ... ) ;
use XML::AutoWriter qw( :dtd_tags ) ;
This associates an XML::AutoWriter and an XML::Doctype with the package. These
are used by the routines when called as functions.
- new
-
$writer = XML::AutoWriter->new( DTD => $dtd, OUTPUT => \*FH ) ;
Creates an XML::AutoWriter.
All other parameters are passed to the XML::ValidWriter base class
constructor.
- characters
-
characters( 'yabba dabba dooo' ) ;
$writer->characters( 'yabba dabba dooo' ) ;
If the currently open tag cannot contain #PCDATA, then start tag
autogeneration will be attempted, followed by end tag autogeneration.
Start tag autogeneration takes place even if you pass in only '', or even
(), the empty list.
- endTag
-
endTag ;
endTag( 'a' ) ;
$writer->endTag ;
$writer->endTag( 'a' ) ;
Prints one or more end tags. The tag name is optional and defaults to the
most recently emitted start tag if not present.
This will emit as many close tags as necessary to close the supplied tag
name, or will emit an error if the tag name specified is not open in the
output document.
- startTag
-
startTag( 'a', attr => val ) ; # use default XML::AutoWriter for
# current package.
$writer->startTag( 'a', attr => val ) ;
Emits a named start tag with optional attributes. If the named tag cannot be
a child of the most recently started tag, then any tags that need to be
opened between that one and the named tag are opened.
If the named tag cannot be enclosed within the most recently opened tag, no
matter how deep, then startTag() tries to end as few started tags
as necessary to allow the named tag to be emitted within a tag already on
the stack.
This warns (once) if no <?xml?> declaration has been emitted. It does
not check to see if a <!DOCTYPE...> has been emitted. It dies if an
attempt is made to emit a second root element.
AUTHOR¶
Barrie Slaymaker <barries@slaysys.com>
COPYRIGHT¶
This module is Copyright 2000, 2005, 2009 Barrie Slaymaker. Some rights
reserved.
This module is licensed under your choice of the Artistic, BSD or General Public
License.