Layout Tags
OpenType Layout tags are 4-byte character strings that identify the scripts, language systems, features and baselines in an OpenType Layout font. Microsoft's Layout tag registry establishes conventions for naming and using these tags. OpenType features are created by using the tags in creating feature scripts that describe how characters are to be manipulated to make the desired feature. These feature scripts can be created and incorporated into OpenType fonts by advanced font editors such as FontLab Studio, AsiaFont Studio, and FontForge.
Operating system and application support for layout tags varies widely. A 2007 presentation summarizing the state of affairs was given by Jürgen Willrodt at TypoTechnica 2007.
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