lspace tag add [OPTIONS] <tag> [<docset>...]
    Add tags and values to documents. Defaults to the current document.

    --tag-file TAG-FILE (valued) tags to attach to the entered documents, read from the file. One tag per line. Value separated from tag by `=`.

    tag    (valued) tag to attach to the entered documents. Value separated from tag by `=`. An empty string is allowed, and ignored.
    docset Ids of the relevant documents. Defaults to the current document.