| Subject | Welsh | English |
| comp., MS | Fformat XML Excel | Excel XML Format (The formal name for Excel 12 file format. The Excel XML Format has an open, royalty-free specification, and is the technology licensed to external parties) |
| comp., MS | Fformat XML Word | Word XML Format (The formal name for Word 12 file format. This format has an open, royalty-free specification, and is the technology licensed to external parties. This license is the subject in the messaging points where "Open, royalty-free license" is discussed) |
| comp., MS | mapio XML tesun cyfoethog | rich text XML mapping (A type of XML mapping that links WordprocessingML content directly to the backing data in the custom XML part) |
| comp., MS | XML Rhaglen Allanol | External Application XML (XML that provides information about an external application and about the Web Part that hosts it) |