Quick Way to Validate XML/Identify Point of Brokenness [closed]

Question

How does one check the validity of an XML file to show where the xml error occurs?

Firefox can do it, but I'd like to do it in linux/windows command line.

eg. I've got a large-ish (90MB) XML file from Excel, saved in XML Spreadsheet 2003 format. It contains various invalid data, so that Firefox spits out messages like this:

Line Number 790402, Column 65:
<Cell ss:StyleID="s18"><Data ss:Type="String">Here's some data I&#5;?Bnternational</Data></Cell>

Firefox is quite slow at parsing my XML(presumably because it's keeping it all in memory ready to render into a nice navigable tree). I'm not bothered about validation against an XSD, just want to know if the XML is well-formed.

Answer 1

There's a linux command called xmllint that is good for this. It's very fast, handles honking great files without barfing, and gives useful validation error messages.