OX Documents is a combination of word processing, spreadsheet and presentation editor. Released is OX Text, which directly reads and writes native ODF and OOXML documents without loss of format. Known document parts are sent to clients via operations and user changes are merged back into the DOM on the server. Merging is easy as OX Text already uses the upcoming ODF change operations as principle design. This session provides a brief introduction of the operation design in OX Text and lessons being learned.