session "Unordered_Resolution" = HOL +
   options [document = pdf, document_output = "output",
    document_variants = "document:outline=/proof,/ML"]
   sessions
     "HOL-Library"
     Resolution_FOL
     TRS
   theories [document = true]
     Unification_Theorem
     Completeness_Instance
   document_files
     "root.bib"
     "root.tex"
     "root.bib"
