[1] Open Document Format for Office Applications (OpenDocument) Version 1.3. Part 3: OpenDocument Schema, , 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, , https://www.w3.org/TR/xslfo20/#writing-mode-related