1XML_SPLIT(1) User Contributed Perl Documentation XML_SPLIT(1)
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6 xml_split - cut a big XML file into smaller chunks
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9 "xml_split" takes a (presumably big) XML file and split it in several
10 smaller files. The memory used is the memory needed for the biggest
11 chunk (ie memory is reused for each new chunk).
12 It can split at a given level in the tree (the default, splits children
14 of the root), or on a condition (using the subset of XPath understood
15 by XML::Twig, so "section" or "/doc/section").
16 Each generated file is replaced by a processing instruction that will
18 allow "xml_merge" to rebuild the original document. The processing
19 instruction format is "<?merge subdocs=[01] :<filename> ?>"
20 File names are <file>-<nb>.xml, with <file>-00.xml holding the main
22 document.
23
25 -l <level>
26 level to cut at: 1 generates a file for each child of the root, 2
27 for each grand child
28 defaults to 1
30 -c <condition>
32 generate a file for each element that passes the condition
33 xml_split -c <section> will put each "section" element in its own
35 file (nested sections are handled too)
36 Note that at the moment this option is a lot slower than using "-l"
38 -s <size>
40 generates files of (approximately) <size>. The content of each file
41 is enclosed in a new element ("xml_split::root"), so it's well-
42 formed XML. The size can be given in bytes, Kb, Mb or Gb.
43 -g <nb>
45 groups <nb> elements in a single file. The content of each file is
46 enclosed in a new element ("xml_split::root"), so it's well-formed
47 XML.
48 -b <name>
50 base name for the output, files will be named <base>-<nb><.ext>
51 <nb> is a sequence number, see below "--nb_digits" <ext> is an
53 extension, see below "--extension"
54 defaults to the original file name (if available) or "out" (if
56 input comes from the standard input)
57 -n <nb>
59 number of digits in the sequence number for each file
60 if more digits than <nb> are needed, then they are used: if
62 "--nb_digits 2" is used and 112 files are generated they will be
63 named "<file>-01.xml" to "<file>-112.xml"
64 defaults to 2
66 -e <ext>
68 extension to use for generated files
69 defaults to the original file extension or ".xml"
71 -i use XInclude elements instead of Processing Instructions to mark
73 where sub files need to be included
74 -v verbose output
76 Note that this option can slow down processing considerably (by an
78 order of magnitude) when generating lots of small documents
79 -V outputs version and exit
81 -h short help
83 -m man (requires pod2text to be in the path)
85
87 xml_split foo.xml # split at level 1
88 xml_split -l 2 foo.xml # split at level 2
89 xml_split -c section foo.xml # a file is generated for each section element
90 # nested sections are split properly
91
93 XML::Twig, xml_merge
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96 optimize the code
97 any idea welcome! I have already implemented most of what I thought
98 would improve performances.
99 provide other methods that PIs to keep merge information
101 XInclude is a good candidate (alpha support added in 0.04).
102 using entities, which would seem the natural way to do it, doesn't
104 work, as they make it impossible to have both the main document and
105 the sub docs to be well-formed if the sub docs include sub-sub docs
106 (you can't have entity declarations in an entity)
107
109 Michel Rodriguez <mirod@cpan.org>
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112 This tool is free software; you can redistribute it and/or modify it
113 under the same terms as Perl itself.
114perl v5.10.1 2009-10-11 XML_SPLIT(1)