OpenType Layout Tag Registry (OpenType 1.9)

The tag registry defines the OpenType Layout tags that Microsoft supports. OpenType Layout tags are 4-byte character strings that identify the scripts, language systems, features and baselines in a OpenType Layout font. The registry establishes conventions for naming and using these tags. Registered tags have a specific meaning and convey precise information to developers and text-processing clients of OpenType Layout. Microsoft encourages font developers to use registered tags to assure compatibility and ease of use across fonts, applications, and operating systems. Microsoft will supply a list of additional tags upon request.

The following sections contain sample sets of commonly used tags for scripts, language systems, and baselines. Microsoft will supply a list of additional tags upon request. In addition, the “Feature tags” section defines all the feature tags Microsoft has developed and registered to date, including descriptions of the functions of each feature.

Microsoft expects the list of registered tags and features to expand over time. The most recent version of the registry will be available on Microsoft’s Web site.

OpenType layout tag registry for:

• Script tags
• Language tags
• Feature tags
• Baseline tags