Topic keyval
key-value argument systems
Preserving and recalling standard catcodes
Key/value support with a hash
Simple creation of commands with key-value arguments
A robust interface to xkeyval
Process 'key=value' schemes
A lightweight and robust key-value parser
Define keys for use in the kvsetkeys package
Key value format for package options
Key value parser with default handler support
LaTeX 2e option processing using LaTeX 3 keys
A robust key parser for LaTeX
Key value control for pgf
Extended and more robust version of pgfkeys
LaTeX package options with pgfkeys
Key-value syntax for pstricks packages
Create commands using parameters and keyval in parallel
Key-value parsing combining features of xkeyval and pgfkeys
Extension of the keyval package
Yet Another Key System