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I am processing XML files using an XSLT stylsheet and wish to report the input line number when a given template is triggered. I can use a DOM (e.g. XOM in Java) which supports a SAX parser so maybe can use a Locator.
Alternatively the XSLT generates an Xpath which could be applied to the original document and so, at least for a human, can lead to the particular line.
(The actual application is to detect error conditions in the XML, which are searched for using XSLT)
Saxon has an extension for this. You can set an option when building the source tree to maintain line number information (e.g. -l on the command line), and if this was set, you can use the extension function saxon:line-number() to get the line number associated with an element node in the tree.