sparql-view-unfold
    Preparing search index...

    Variable VAR_PREFIX_MERGED_HEADConst

    VAR_PREFIX_MERGED_HEAD: "m_" = 'm_'

    Prefix of the three variables ?m_s ?m_p ?m_o of the generic head several mappings are merged into. Load-bearing in the same way VAR_PREFIX_MAPPING is: it must not be a VAR_PREFIX_USER_QUERY.