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

markup language Markup language refers to a text-encoding system consisting of a set of symbols inserted in a text document to control its structure, formatting, or the relationship between its parts. Markup is often used to control the display of the document ...

similar to

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

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

NASA The National Aeronautics and Space Administration (NASA ) is an independent agency of the US federal government responsible for the civil space program, aeronautics research, and space research. NASA was established in 1958, succeedi ...

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