Validating empty data from xml files

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Remember, though, that the more complicated a comparison condition you have, the more work the XSLT processor must do, so the slower the stylesheet will run.

If you know that all potential duplicate elements are siblings, as they are in this chapter's examples, you can speed things up by using the elements.

October 2, 2002 Bob Du Charme When we copy a source tree to a result tree, the task of deleting duplicate elements from the copy sounds simple: don't copy an element from the source tree to the result tree if an identical one has already been copied. According to the XPath specification, two node sets are considered equal if their string values are equal.

The string values are the concatenation of any text node descendants of the elements.

XMLStarlet is a set of command line utilities (tools) which can be used to transform, query, validate, and edit XML documents and files using simple set of shell commands in similar way it is done for plain text files using UNIX grep, sed, awk, diff, patch, join, etc commands.

So, if you only want to compare element content when determining which elements are duplicates, an equals sign will do, but if you want to consider attribute values, you have to explicitly say so. While no two ("line ID") attribute value along with possible other differences -- we'll examine several ways to avoid copying certain elements to the result tree because they have content or an attribute value in common with others.

XMLStarlet command line utility is written in C and uses libxml2 and libxslt from

Implementation of extensive choice of options for XMLStarlet utility was only possible because of rich feature set of libxml2 and libxslt (many thanks to the developers of those libraries for great work).'diff' and 'patch' options are not currently implemented. Please, send an email to the project administrator (see if you wish to help.

(All sample files are in this zip file.) As I mentioned above, the XPath spec considers elements equal if the string values that represent their contents are equal, and the contents are the parts between the tags, so attribute values aren't considered in this kind of equality test.

So, this stylesheet adds only one elements would just mean declaring another local variable and adding another condition inside the square brackets.

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