Created attachment 204259 [details] Example with data-mappings element The file format for LibreOffice is specified in https://opengrok.libreoffice.org/xref/core/schema/libreoffice/ The schema files there should contain all elements and attributes, that LibreOffice uses in addition to the ODF 1.4 standard. Thus the `calcext:data-mappings` and its child elements and attributes have to be included there. But they are totally missing, although the feature "Data Provider" exists since 2017. They are listed in https://wiki.documentfoundation.org/Development/ODF_Implementer_Notes/List_of_LibreOffice_ODF_Extensions The attached file contains an example of the elements and attributes. Look at the end of the file.
Created attachment 204260 [details] The source used in the example