stag-diff(1p) [debian man page]

STAG-DIFF(1p)						User Contributed Perl Documentation					     STAG-DIFF(1p)

NAME

       stag-diff - finds the difference between two stag files

SYNOPSIS

	 stag-diff -ignore foo-id -ignore bar-id file1.xml file2.xml

DESCRIPTION

       Compares two data trees and reports whether they match. If they do not match, the mismatch is reported.

   ARGUMENTS
       -help|h
	   shows this document

       -ignore|i ELEMENT
	   these nodes are ignored for the purposes of comparison. Note that attributes are treated as elements, prefixed by the containing
	   element id. For example, if you have

	     <foo ID="wibble">

	   And you wish to ignore the ID attribute, then you would use the switch

	     -ignore foo-ID

	   You can specify multiple elements to ignore like this

	     -i foo -i bar -i baz

	   You can also specify paths

	     -i foo/bar/bar-id

       -parser|p FORMAT
	   which parser to use. The default is XML. This can also be autodetected by the file suffix. Other alternatives are sxpr and itext. See
	   Data::Stag for details.

       -report|r ELEMENT
	   report mismatches as they occur on each element of type ELEMENT

	   multiple elements can be specified

       -verbose|v
	   used in conjunction with the -report switch

	   shows the tree of the mismatching element

   OUTPUT
       If a mismatch is reported, a report is generated displaying the subpart of the tree that could not be matched. This will look like this:

       REASON: no_matching_node: annotation
	 no_matching_node: feature_set
	   no_matching_node: feature_span
	     no_matching_node: evidence
	       no_matching_node: evidence-id
		 data_mismatch(:15077290 ne :15077291): evidence-id AND evidence-id

       Due to the nature of tree matching, it can be difficult to specify exactly how trees do not match. To investigate this, you may need to use
       the -r and -v options. For the above output, I would recommend using

	 stag-diff -r feature_span -v

   ALGORITHM
       Both trees are recursively traversed... see the actual code for how this works

       The order of elements is not important; eg

	 <foo>
	   <bar>
	     <baz>1</baz>
	   </bar>
	   <bar>
	     <baz>2</baz>
	   </bar>
	 </foo>

       matches

	 <foo>
	   <bar>
	     <baz>2</baz>
	   </bar>
	   <bar>
	     <baz>1</baz>
	   </bar>
	 </foo>

       The recursive nature of this algorithm means that certain tree comparisons will explode wrt time and memory. I think this will only happen
       with very deep trees where nodes high up in the tree can only be differentiated by nodes low down in the tree.

       Both trees are loaded into memory to begin with, so it may thrash with very large documents

   AUTHOR
       Chris Mungall cjm at fruitfly dot org

SEE ALSO

       Data::Stag

perl v5.10.0							    2008-12-23							     STAG-DIFF(1p)

Check Out this Related Man Page

STAG-FILTER(1p) 					User Contributed Perl Documentation					   STAG-FILTER(1p)

NAME

       stag-filter - filters a stag file (xml, itext, sxpr) for nodes of interest

SYNOPSIS

	 stag-filter person -q name=fred file1.xml

	 stag-filter person 'sub {shift->get_name =~ /^A*/}' file1.xml

	 stag-filter -p My::Foo -w sxpr record 'sub{..}' file2

USAGE

	 stag-filter [-p|parser PARSER] [-w|writer WRITER] NODE -q tag=val FILE

	 stag-filter [-p|parser PARSER] [-w|writer WRITER] NODE SUB FILE

	 stag-filter [-p|parser PARSER] [-w|writer WRITER]  NODE -f PERLFILE FILE

DESCRIPTION

       parsers an input file using the specified parser (which may be a built in stag parser, such as xml) and filters the resulting stag tree
       according to a user-supplied subroutine, writing out only the nodes/elements that pass the test.

       the parser is event based, so it should be able to handle large files (although if the node you parse is large, it will take up more
       memory)

ARGUMENTS

       -p|parser FORMAT
	   FORMAT is one of xml, sxpr or itext, or the name of a perl module

	   xml assumed as default

       -w|writer FORMAT
	   FORMAT is one of xml, sxpr or itext, or the name of a perl module

       -c|count
	   prints the number of nodes that pass the test

       -filterfile|f
	   a file containing a perl subroutine (in place of the SUB argument)

       -q|query TAG1=VAL1 -q|query TAG2=VAL2 ...  -q|query TAGN=VALN
	   filters based on the field TAG

	   other operators can be used too - eg <, <=, etc

	   multiple q arguments can be passed in

	   for more complex operations, pass in your own subroutine, see below

       SUB a perl subroutine. this subroutine is evaluated evry time NODE is encountered - the stag object for NODE is passed into the subroutine.

	   if the subroutine passes, the node will be passed to the writer for display

       NODE
	   the name of the node/element we are filtering on

       FILE
	   the file to be parser. If no parser option is supplied, this is assumed to a be a stag compatible syntax (xml, sxpr or itext);
	   otherwise you should parse in a parser name or a parser module that throws stag events

SEE ALSO

       Data::Stag

perl v5.10.0							    2008-12-23							   STAG-FILTER(1p)

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stag-diff(1p) [debian man page]

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