1 .\" Automatically generated by Pod::Man 2.22 (Pod::Simple 3.10)
4 .\" ========================================================================
5 .de Sp \" Vertical space (when we can't use .PP)
9 .de Vb \" Begin verbatim text
14 .de Ve \" End verbatim text
18 .\" Set up some character translations and predefined strings. \*(-- will
19 .\" give an unbreakable dash, \*(PI will give pi, \*(L" will give a left
20 .\" double quote, and \*(R" will give a right double quote. \*(C+ will
21 .\" give a nicer C++. Capital omega is used to do unbreakable dashes and
22 .\" therefore won't be available. \*(C` and \*(C' expand to `' in nroff,
23 .\" nothing in troff, for use with C<>.
25 .ds C+ C\v'-.1v'\h'-1p'\s-2+\h'-1p'+\s0\v'.1v'\h'-1p'
29 . if (\n(.H=4u)&(1m=24u) .ds -- \(*W\h'-12u'\(*W\h'-12u'-\" diablo 10 pitch
30 . if (\n(.H=4u)&(1m=20u) .ds -- \(*W\h'-12u'\(*W\h'-8u'-\" diablo 12 pitch
43 .\" Escape single quotes in literal strings from groff's Unicode transform.
47 .\" If the F register is turned on, we'll generate index entries on stderr for
48 .\" titles (.TH), headers (.SH), subsections (.SS), items (.Ip), and index
49 .\" entries marked with X<> in POD. Of course, you'll have to process the
50 .\" output yourself in some meaningful fashion.
53 . tm Index:\\$1\t\\n%\t"\\$2"
63 .\" Accent mark definitions (@(#)ms.acc 1.5 88/02/08 SMI; from UCB 4.2).
64 .\" Fear. Run. Save yourself. No user-serviceable parts.
65 . \" fudge factors for nroff and troff
74 . ds #H ((1u-(\\\\n(.fu%2u))*.13m)
80 . \" simple accents for nroff and troff
90 . ds ' \\k:\h'-(\\n(.wu*8/10-\*(#H)'\'\h"|\\n:u"
91 . ds ` \\k:\h'-(\\n(.wu*8/10-\*(#H)'\`\h'|\\n:u'
92 . ds ^ \\k:\h'-(\\n(.wu*10/11-\*(#H)'^\h'|\\n:u'
93 . ds , \\k:\h'-(\\n(.wu*8/10)',\h'|\\n:u'
94 . ds ~ \\k:\h'-(\\n(.wu-\*(#H-.1m)'~\h'|\\n:u'
95 . ds / \\k:\h'-(\\n(.wu*8/10-\*(#H)'\z\(sl\h'|\\n:u'
97 . \" troff and (daisy-wheel) nroff accents
98 .ds : \\k:\h'-(\\n(.wu*8/10-\*(#H+.1m+\*(#F)'\v'-\*(#V'\z.\h'.2m+\*(#F'.\h'|\\n:u'\v'\*(#V'
99 .ds 8 \h'\*(#H'\(*b\h'-\*(#H'
100 .ds o \\k:\h'-(\\n(.wu+\w'\(de'u-\*(#H)/2u'\v'-.3n'\*(#[\z\(de\v'.3n'\h'|\\n:u'\*(#]
101 .ds d- \h'\*(#H'\(pd\h'-\w'~'u'\v'-.25m'\f2\(hy\fP\v'.25m'\h'-\*(#H'
102 .ds D- D\\k:\h'-\w'D'u'\v'-.11m'\z\(hy\v'.11m'\h'|\\n:u'
103 .ds th \*(#[\v'.3m'\s+1I\s-1\v'-.3m'\h'-(\w'I'u*2/3)'\s-1o\s+1\*(#]
104 .ds Th \*(#[\s+2I\s-2\h'-\w'I'u*3/5'\v'-.3m'o\v'.3m'\*(#]
105 .ds ae a\h'-(\w'a'u*4/10)'e
106 .ds Ae A\h'-(\w'A'u*4/10)'E
107 . \" corrections for vroff
108 .if v .ds ~ \\k:\h'-(\\n(.wu*9/10-\*(#H)'\s-2\u~\d\s+2\h'|\\n:u'
109 .if v .ds ^ \\k:\h'-(\\n(.wu*10/11-\*(#H)'\v'-.4m'^\v'.4m'\h'|\\n:u'
110 . \" for low resolution devices (crt and lpr)
111 .if \n(.H>23 .if \n(.V>19 \
124 .\" ========================================================================
126 .IX Title "XML::LibXML::Pattern 3"
127 .TH XML::LibXML::Pattern 3 "2009-10-07" "perl v5.8.7" "User Contributed Perl Documentation"
128 .\" For nroff, turn off justification. Always turn off hyphenation; it makes
129 .\" way too many mistakes in technical documents.
133 XML::LibXML::Pattern \- XML::LibXML::Pattern \- interface to libxml2 XPath patterns
135 .IX Header "SYNOPSIS"
138 \& my $pattern = new XML::LibXML::Pattern(\*(Aq/x:html/x:body//x:div\*(Aq, { \*(Aqx\*(Aq => \*(Aqhttp://www.w3.org/1999/xhtml\*(Aq });
139 \& # test a match on a XML::LibXML::Node $node
141 \& if ($pattern\->matchesNode($node)) { ... }
143 \& # or on a XML::LibXML::Reader
145 \& if ($reader\->matchesPattern($pattern)) { ... }
147 \& # or skip reading all nodes that do not match
149 \& print $reader\->nodePath while $reader\->nextPatternMatch($pattern);
151 \& $pattern = XML::LibXML::Pattern\->new( pattern, { prefix => namespace_URI, ... } );
152 \& $bool = $pattern\->matchesNode($node);
155 .IX Header "DESCRIPTION"
156 This is a perl interface to libxml2's pattern matching support \fIhttp://xmlsoft.org/html/libxml\-pattern.html\fR. This feature requires recent versions of libxml2.
158 Patterns are a small subset of XPath language, which is limitted to
159 (disjunctions of) location paths involving the child and descendant axes in
160 abbreviated form as described by the extended \s-1BNF\s0 given below:
163 \& Selector ::= Path ( \*(Aq|\*(Aq Path )*
164 \& Path ::= (\*(Aq.//\*(Aq | \*(Aq//\*(Aq | \*(Aq/\*(Aq )? Step ( \*(Aq/\*(Aq Step )*
165 \& Step ::= \*(Aq.\*(Aq | NameTest
166 \& NameTest ::= QName | \*(Aq*\*(Aq | NCName \*(Aq:\*(Aq \*(Aq*\*(Aq
169 For readability, whitespace may be used in selector XPath expressions even
170 though not explicitly allowed by the grammar: whitespace may be freely added
171 within patterns before or after any token, where
174 \& token ::= \*(Aq.\*(Aq | \*(Aq/\*(Aq | \*(Aq//\*(Aq | \*(Aq|\*(Aq | NameTest
177 Note that no predicates or attribute tests are allowed.
179 Patterns are particularly useful for stream parsing provided via the \f(CW\*(C`XML::LibXML::Reader\*(C'\fR interface.
183 \& $pattern = XML::LibXML::Pattern\->new( pattern, { prefix => namespace_URI, ... } );
186 The constructor of a pattern takes a pattern expression (as described by the
187 \&\s-1BNF\s0 grammar above) and an optional \s-1HASH\s0 reference mapping prefixes to namespace
188 URIs. The method returns a compiled pattern object.
190 Note that if the document has a default namespace, it must still be given an
191 prefix in order to be matched (as demanded by the XPath 1.0 specification). For
192 example, to match an element \f(CW\*(C`<a xmlns="http://foo.bar"</a>\*(C'\fR, one should use a pattern like this:
195 \& $pattern = XML::LibXML::Pattern\->new( \*(Aqfoo:a\*(Aq, { foo => \*(Aqhttp://foo.bar\*(Aq });
197 .IP "matchesNode($node)" 4
198 .IX Item "matchesNode($node)"
200 \& $bool = $pattern\->matchesNode($node);
203 Given a XML::LibXML::Node object, returns a true value if the node is matched
204 by the compiled pattern expression.
206 .IX Header "SEE ALSO"
207 XML::LibXML::Reader for other methods involving compiled patterns.
217 .IX Header "COPYRIGHT"
218 2001\-2007, AxKit.com Ltd.
220 2002\-2006, Christian Glahn.
222 2006\-2009, Petr Pajas.