src/Doc/Demo_LLNCS/ROOT

clarified options: support lualatex as well, but prefer old pdflatex for demos;

chapter Doc  (*Isabelle documentation*)

session Demo_LLNCS (doc) = HOL +
  options [
    document_variants = "demo_llncs",  (*Isabelle documentation*)
    document_build = "pdflatex"  (*or: omit option for LuaLaTeX*)
  ]
  theories
    Document
  document_files (in "$ISABELLE_LLNCS_HOME")
    "llncs.cls"
    "splncs04.bst"
  document_files
    "root.bib"
    "root.tex"