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+.\" ========================================================================
+.\"
+.IX Title "SAX::ParserFactory 3"
+.TH SAX::ParserFactory 3 "2008-08-04" "perl v5.8.7" "User Contributed Perl Documentation"
+.\" For nroff, turn off justification. Always turn off hyphenation; it makes
+.\" way too many mistakes in technical documents.
+.if n .ad l
+.nh
+.SH "NAME"
+XML::SAX::ParserFactory \- Obtain a SAX parser
+.SH "SYNOPSIS"
+.IX Header "SYNOPSIS"
+.Vb 6
+\& use XML::SAX::ParserFactory;
+\& use XML::SAX::XYZHandler;
+\& my $handler = XML::SAX::XYZHandler\->new();
+\& my $p = XML::SAX::ParserFactory\->parser(Handler => $handler);
+\& $p\->parse_uri("foo.xml");
+\& # or $p\->parse_string("<foo/>") or $p\->parse_file($fh);
+.Ve
+.SH "DESCRIPTION"
+.IX Header "DESCRIPTION"
+XML::SAX::ParserFactory is a factory class for providing an application
+with a Perl \s-1SAX2\s0 \s-1XML\s0 parser. It is akin to \s-1DBI\s0 \- a front end for other
+parser classes. Each new \s-1SAX2\s0 parser installed will register itself
+with \s-1XML::SAX\s0, and then it will become available to all applications
+that use XML::SAX::ParserFactory to obtain a \s-1SAX\s0 parser.
+.PP
+Unlike \s-1DBI\s0 however, \s-1XML/SAX\s0 parsers almost all work alike (especially
+if they subclass XML::SAX::Base, as they should), so rather than
+specifying the parser you want in the call to \f(CW\*(C`parser()\*(C'\fR, \s-1XML::SAX\s0
+has several ways to automatically choose which parser to use:
+.IP "\(bu" 4
+\&\f(CW$XML::SAX::ParserPackage\fR
+.Sp
+If this package variable is set, then this package is \f(CW\*(C`require()\*(C'\fRd
+and an instance of this package is returned by calling the \f(CW\*(C`new()\*(C'\fR
+class method in that package. If it cannot be loaded or there is
+an error, an exception will be thrown. The variable can also contain
+a version number:
+.Sp
+.Vb 1
+\& $XML::SAX::ParserPackage = "XML::SAX::Expat (0.72)";
+.Ve
+.Sp
+And the number will be treated as a minimum version number.
+.IP "\(bu" 4
+Required features
+.Sp
+It is possible to require features from the parsers. For example, you
+may wish for a parser that supports validation via a \s-1DTD\s0. To do that,
+use the following code:
+.Sp
+.Vb 4
+\& use XML::SAX::ParserFactory;
+\& my $factory = XML::SAX::ParserFactory\->new();
+\& $factory\->require_feature(\*(Aqhttp://xml.org/sax/features/validation\*(Aq);
+\& my $parser = $factory\->parser(...);
+.Ve
+.Sp
+Alternatively, specify the required features in the call to the
+ParserFactory constructor:
+.Sp
+.Vb 5
+\& my $factory = XML::SAX::ParserFactory\->new(
+\& RequiredFeatures => {
+\& \*(Aqhttp://xml.org/sax/features/validation\*(Aq => 1,
+\& }
+\& );
+.Ve
+.Sp
+If the features you have asked for are unavailable (for example the
+user might not have a validating parser installed), then an
+exception will be thrown.
+.Sp
+The list of known parsers is searched in reverse order, so it will
+always return the last installed parser that supports all of your
+requested features (Note: this is subject to change if someone
+comes up with a better way of making this work).
+.IP "\(bu" 4
+\&\s-1SAX\s0.ini
+.Sp
+ParserFactory will search \f(CW@INC\fR for a file called \s-1SAX\s0.ini, which
+is in a simple format:
+.Sp
+.Vb 3
+\& # a comment looks like this,
+\& ; or like this, and are stripped anywhere in the file
+\& key = value # SAX.in contains key/value pairs.
+.Ve
+.Sp
+All whitespace is non-significant.
+.Sp
+This file can contain either a line:
+.Sp
+.Vb 1
+\& ParserPackage = MyParserModule (1.02)
+.Ve
+.Sp
+Where MyParserModule is the module to load and use for the parser,
+and the number in brackets is a minimum version to load.
+.Sp
+Or you can list required features:
+.Sp
+.Vb 1
+\& http://xml.org/sax/features/validation = 1
+.Ve
+.Sp
+And each feature with a true value will be required.
+.IP "\(bu" 4
+Fallback
+.Sp
+If none of the above works, the last parser installed on the user's
+system will be used. The \s-1XML::SAX\s0 package ships with a pure perl
+\&\s-1XML\s0 parser, XML::SAX::PurePerl, so that there will always be a
+fallback parser.
+.SH "AUTHOR"
+.IX Header "AUTHOR"
+Matt Sergeant, matt@sergeant.org
+.SH "LICENSE"
+.IX Header "LICENSE"
+This is free software, you may use it and distribute it under the same
+terms as Perl itself.
projects / catagits/Gitalist.git / blobdiff