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xml_split - cut a big XML file into smaller chunks


"xml_split" takes a (presumably big) XML file and split it in several smaller files. The
memory used is the memory needed for the biggest chunk (ie memory is reused for each new

It can split at a given level in the tree (the default, splits children of the root), or
on a condition (using the subset of XPath understood by XML::Twig, so "section" or

Each generated file is replaced by a processing instruction that will allow "xml_merge" to
rebuild the original document. The processing instruction format is "<?merge subdocs=[01]
:<filename> ?>"

File names are <file>-<nb>.xml, with <file>-00.xml holding the main document.


-l <level>
level to cut at: 1 generates a file for each child of the root, 2 for each grand child

defaults to 1

-c <condition>
generate a file for each element that passes the condition

xml_split -c <section> will put each "section" element in its own file (nested
sections are handled too)

Note that at the moment this option is a lot slower than using "-l"

-s <size>
generates files of (approximately) <size>. The content of each file is enclosed in a
new element ("xml_split::root"), so it's well-formed XML. The size can be given in
bytes, Kb, Mb or Gb.

-g <nb>
groups <nb> elements in a single file. The content of each file is enclosed in a new
element ("xml_split::root"), so it's well-formed XML.

-b <name>
base name for the output, files will be named <base>-<nb><.ext>

<nb> is a sequence number, see below "--nb_digits" <ext> is an extension, see below

defaults to the original file name (if available) or "out" (if input comes from the
standard input)

-n <nb>
number of digits in the sequence number for each file

if more digits than <nb> are needed, then they are used: if "--nb_digits 2" is used
and 112 files are generated they will be named "<file>-01.xml" to "<file>-112.xml"

defaults to 2

-e <ext>
extension to use for generated files

defaults to the original file extension or ".xml"

-i use XInclude elements instead of Processing Instructions to mark where sub files need
to be included

-v verbose output

Note that this option can slow down processing considerably (by an order of magnitude)
when generating lots of small documents

-V outputs version and exit

-h short help

-m man (requires pod2text to be in the path)


xml_split foo.xml # split at level 1
xml_split -l 2 foo.xml # split at level 2
xml_split -c section foo.xml # a file is generated for each section element
# nested sections are split properly

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