GML Syntax Validator

Yesterday we announced the GML 1.0 spec, a canonical reference for what constitutes Graffiti Markup Language. Today I’m pleased to announce the GML Syntax Validator, a tool to help developers working on new GML applications debug & optimize their Graffiti Markup Language files. Just say “NO!” to bad GML.

A “Validate This” button is now available in the sidebar of every 000000book tag page, or you can upload GML directly via file, form, or a simple API. Check out some example usage.

This is a beta release and bugs/feedback are much appreciated — please email me & Evan or hit up your friendly neighborhood GML mailing list

What does it validate?

• overall document syntax (valid XML)
• presence of all required GML tags (bottom of the page – drawing, stroke, tag, pt, x/y)
• verifies point data falls between 0.0 and 1.0 values
• client description (info about your app)
• your <environment> description (e.g. <up> vector & <screenBounds>, since all screens are different)
• recommendations — e.g. adding a consistent <uniqueKey> value, like an iPhone UUID or hashed computer MAC address. This allows users to enable 00000book device pairing for tags uploaded from your app