OOXML

An XML-based file format standard for representing documents, spreadsheets, presentations, and charts in Microsoft Office applications (Word, Excel, PowerPoint). Introduced in Office 2007, OOXML files use extensions like .docx, .xlsx, and .pptx. For accessibility, the XML structure allows assistive technologies and accessibility tools to programmatically extract content, structure, and data that would otherwise be locked in proprietary binary formats. This enables creation of alternative presentations such as text descriptions of charts or haptic renderings of graphs.