“The new digital standard for tomorrow’s vandals.”

This is the reference Graffiti Markup Language (GML) file format specification.
GML is an XML-based file format specifically designed for archiving graffiti tags.

The spec is available online here:
http://fffff.at/gml

For apps, data, and sample code, visit:
http://graffitianalysis.com
http://000000book.com