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- TagML: Markup an XML file for translation purpose by identifying tags and content in "normal", "internal", or "external" styles. "Normal" text are translatable, "internal" text are involved in translation, but not translatable, "external" text are excluded from translation.
- Text Encoding Initiative – guidelines for text encoding, with schemas and a mechanism to customise to individual project needs.
- ThML – Theological Markup Language created by Christian Classics Ethereal Library (CCEL), to create electronic theological texts.
- Topicmaps
- TransducerML – Open Geospatial Consortium language for describing sensors and their output
- Translation Memory eXchange (TMX): translation memory data
- TREX: a simple schema language
- Twitter Markup Language (TML): Twitter markup language - subset of RTML - both created by Jack Hidary - managed by the non-profit TML Consortium
Read more about this topic: List Of XML Markup Languages