PPML (Personalized Print Markup Language) is an XML-based industry standard printer language for variable data printing defined by PODi.
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The Printing On Demand Initiative (PODi) is responsible for the concept and development of this new PPML standard.
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"CheckPPML" (the PODi viewer) is a virtual PPML consumer that provides error-checking and PDF output in addition to viewing.
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PODi also provides a viewer which is widely accepted as the reference implementation for testing PPML output.