[1] Open Document Format for Office Applications (OpenDocument) Version 1.3. Part 3: OpenDocument Schema, 2019-12-25T17:00:00.000Z, 2020-10-23T12:45:44.793Z https://docs.oasis-open.org/office/OpenDocument/v1.3/cs01/part3-schema/OpenDocument-v1.3-cs01-part3-schema.html#property-style_glyph-orientation-vertical

[2] Extensible Stylesheet Language (XSL) Version 2.0, 2018-10-09T13:22:10.000Z, 2020-10-23T12:55:38.423Z https://www.w3.org/TR/xslfo20/#writing-mode-related