The single and only interpretation that goes from that to "designed for editing text documents" is the fact that the authors called them "XML Documents". But XM

The single and only interpretation that goes from that to "designed for editing text documents" is the fact that the authors called them "XML Documents". But XML Documents != "text documents". XML Documents are big property bags of data, and have no correlation with "editing text documents". The primary use of XML was, and remains, data exchange, where system A generates data that is consumed by system B.