In computer programming, Parameter Value Language (PVL) is a

markup language A markup language is a Encoding, text-encoding system which specifies the structure and formatting of a document and potentially the relationships among its parts. Markup can control the display of a document or enrich its content to facilitate au ...

similar to

XML Extensible Markup Language (XML) is a markup language and file format for storing, transmitting, and reconstructing data. It defines a set of rules for encoding electronic document, documents in a format that is both human-readable and Machine-r ...

. It is commonly employed for entries in the Planetary Database System used by

NASA The National Aeronautics and Space Administration (NASA ) is an independent agencies of the United States government, independent agency of the federal government of the United States, US federal government responsible for the United States ...

to store mission data, among other uses. There are at least two "dialects" – ''USGS Isis Cube Label'' and ''NASA PDS 3 Label''.

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Specification
Markup languages Technical communication Computer file formats Data modeling languages {{Tech-stub