diff --git a/NLPPlus/__init__.py b/NLPPlus/__init__.py
index 3516e2d..35aed7f 100644
--- a/NLPPlus/__init__.py
+++ b/NLPPlus/__init__.py
@@ -270,7 +270,7 @@ def clear_logs(self, analyzer_name: PathLike) -> int:
         return removed
 
     def analyze(self, text: str, analyzer_name: PathLike, develop: bool = False,
-                compiled: bool = False) -> Results:
+                compiled: bool = False, datum: Optional[str] = None) -> Results:
         """Analyze text with the named analyzer.
 
         Args:
@@ -287,6 +287,10 @@ def analyze(self, text: str, analyzer_name: PathLike, develop: bool = False,
                     package README for the cmake / cloud build step
                     that turns them into the actual ``.so``/``.dylib``/
                     ``.dll`` files.
+          datum: a string the analyzer reads as ``G("$datum")``, for this
+                 call only -- eg the output format the caller wants
+                 (``"json"``, ``"xml"``). None (the default) is none, and
+                 ``G("$datum")`` is then 0.
         """
         outdir = self.analyzer_dir(analyzer_name) / "output"
         # Delete the files of the previous run in the outdir.
@@ -294,7 +298,7 @@ def analyze(self, text: str, analyzer_name: PathLike, develop: bool = False,
             if os.path.isfile(file_path):
                 os.remove(file_path)
         outtext = self.engine.analyze(self._engine_analyzer_arg(analyzer_name),
-                                      text, develop, compiled)
+                                      text, develop, compiled, datum or "")
         return Results(outtext, outdir)
 
     def compile(self, analyzer_name: PathLike, develop: bool = False,
@@ -524,14 +528,16 @@ def put_json_object(analyzer_name: str, obj: Any, name: str) -> Path:
 
 
 def analyze(text: str, parser: str = "parse-en-us", develop: bool = False,
-            compiled: bool = False) -> str:
+            compiled: bool = False, datum: Optional[str] = None) -> str:
     """Run the analyzer named on the input string.
 
     If ``compiled=True``, the engine loads the analyzer's compiled
     shared libraries (``bin/run.<ext>`` and ``bin/kb.<ext>``) instead of
     running interpreted.  See :func:`compile` for producing those.
+    ``datum`` reaches the analyzer as ``G("$datum")``; see
+    :meth:`Engine.analyze`.
     """
-    return engine.analyze(text, parser, develop, compiled).output_text
+    return engine.analyze(text, parser, develop, compiled, datum).output_text
 
 
 def compile(analyzer: str = "parse-en-us", develop: bool = False,
diff --git a/bindings.cpp b/bindings.cpp
index 17ec567..d99b12e 100644
--- a/bindings.cpp
+++ b/bindings.cpp
@@ -108,8 +108,11 @@ wrap_init(NLP_ENGINE *self, const std::string &workingFolder,
 const std::string
 wrap_analyze(NLP_ENGINE &engine, const std::string &parser,
              const std::string &input, const bool develop,
-             const bool compiled) {
+             const bool compiled, const std::string &datum) {
     CLocaleGuard cLocale;
+    // For this call only: the analyzer sees it as G("$datum"), eg the
+    // output format the caller wants. "" (the default) is none.
+    engine.setDatum(datum.c_str());
     _TCHAR *_parser = _tcsdup(parser.c_str());
     std::istringstream instream(input);
     std::ostringstream outstream;
@@ -184,7 +187,7 @@ NB_MODULE(bindings, m) {
              "silent"_a = true)
         .def("analyze", &wrap_analyze,
              "parser"_a, "input"_a, "develop"_a = false,
-             "compiled"_a = false,
+             "compiled"_a = false, "datum"_a = "",
              "Analyze `input` with `parser`.\n"
              "The `parser` argument refers to an analyzer contained in the\n"
              "`analyzers` folder inside the workingFolder used to create\n"
@@ -193,7 +196,9 @@ NB_MODULE(bindings, m) {
              "bin/kb.<ext> from the analyzer dir instead of running\n"
              "interpreted from the .nlp source.  Build those shared\n"
              "libraries first via `compile()` plus an external cmake/\n"
-             "cloud build step.")
+             "cloud build step.\n"
+             "`datum` reaches the analyzer as G(\"$datum\"), eg the output\n"
+             "format wanted; \"\" (the default) is none.")
         .def("compile", &wrap_compile,
              "analyzer"_a, "develop"_a = false, "kbOnly"_a = false,
              "analyzerOnly"_a = false,
diff --git a/tests/analyzers/datum/kb/user/attr.kb b/tests/analyzers/datum/kb/user/attr.kb
new file mode 100644
index 0000000..9ef2096
--- /dev/null
+++ b/tests/analyzers/datum/kb/user/attr.kb
@@ -0,0 +1,254 @@
+ind attr
+"concept"
+0
+"concept" "sys" "attrs" "common" "var"
+psym
+"cg_CONCEPT"
+end ind
+
+
+ind attr
+"concept" "gram"
+0
+"concept" "sys" "dict" "a" "x" "xu" "xwhite"
+pst
+"true"
+end ind
+
+
+ind attr
+"concept" "gram"
+0
+"concept" "sys" "dict" "a" "c" "co" "constrain"
+pst
+"true"
+end ind
+
+
+ind attr
+"concept" "gram"
+0
+"concept" "sys" "dict" "a" "c" "cl" "closed"
+pst
+"false"
+end ind
+
+
+ind attr
+"concept" "gram"
+0
+"concept" "sys" "dict" "a" "l" "li" "lit"
+pst
+"false"
+end ind
+
+
+ind attr
+"concept" "gram"
+0
+"concept" "sys" "dict" "a" "s" "sp" "split"
+pst
+"false"
+end ind
+
+
+ind attr
+"concept" "gram"
+0
+"concept" "sys" "dict" "a" "g" "ge" "gen"
+pst
+"false"
+end ind
+
+
+ind attr
+"concept" "gram"
+0
+"concept" "sys" "dict" "a" "l" "lo" "locked"
+pst
+"false"
+end ind
+
+
+ind attr
+"concept" "gram"
+0
+"concept" "sys" "dict" "a" "d" "di" "dirty"
+pst
+"true"
+end ind
+
+
+ind attr
+"concept" "gram"
+0
+"concept" "sys" "dict" "a" "q" "qu" "quicksem"
+pst
+"false"
+end ind
+
+
+ind attr
+"concept" "sys"
+0
+"concept" "sys" "attrs" "common" "var"
+psym
+"con_SYS"
+end ind
+
+
+ind attr
+"concept" "sys" "attrs"
+0
+"concept" "sys" "attrs" "common" "var"
+psym
+"sys_ATTRS"
+end ind
+
+
+ind attr
+"concept" "sys" "attrs" "proxy"
+0
+"concept" "sys" "attrs" "common" "var"
+psym
+"attrs_PROXY"
+end ind
+
+
+ind attr
+"concept" "sys" "attrs" "proxy" "atom"
+0
+"concept" "sys" "attrs" "common" "var"
+psym
+"cg_ATOM"
+end ind
+
+
+ind attr
+"concept" "sys" "attrs" "pproxy"
+0
+"concept" "sys" "attrs" "common" "var"
+psym
+"attrs_PPROXY"
+end ind
+
+
+ind attr
+"concept" "sys" "attrs" "pproxy" "phrase"
+0
+"concept" "sys" "attrs" "common" "var"
+psym
+"cg_PHRASE"
+end ind
+
+
+ind attr
+"concept" "sys" "attrs" "common"
+0
+"concept" "sys" "attrs" "common" "var"
+psym
+"attrs_COMMON"
+end ind
+
+
+ind attr
+"concept" "sys" "attrs" "common" "var"
+0
+"concept" "sys" "attrs" "common" "var"
+psym
+"cg_VAR"
+end ind
+
+
+ind attr
+"concept" "sys" "nlp"
+0
+"concept" "sys" "attrs" "common" "var"
+psym
+"sys_NLP"
+end ind
+
+
+ind attr
+"concept" "sys" "nlp" "lex" "slot" "cases"
+0
+"concept" "sys" "attrs" "common" "var"
+psym
+"id_CASES"
+end ind
+
+
+ind attr
+"concept" "sys" "mean" "slot" "case"
+0
+"concept" "sys" "attrs" "common" "var"
+psym
+"id_mslot_CASE"
+end ind
+
+
+ind attr
+"concept" "sys" "mean" "slot" "case" "cap"
+0
+"concept" "sys" "attrs" "common" "var"
+psym
+"id_CAP"
+end ind
+
+
+ind attr
+"concept" "sys" "mean" "slot" "case" "allcap"
+0
+"concept" "sys" "attrs" "common" "var"
+psym
+"id_ALLCAP"
+end ind
+
+
+ind attr
+"concept" "sys" "mean" "slot" "case" "mixed"
+0
+"concept" "sys" "attrs" "common" "var"
+psym
+"id_MIXED"
+end ind
+
+
+ind attr
+"concept" "sys" "mean" "slot" "mixed"
+0
+"concept" "sys" "attrs" "common" "var"
+psym
+"id_mslot_MIXED"
+end ind
+
+
+ind attr
+"concept" "sys" "dict"
+0
+"concept" "sys" "attrs" "common" "var"
+psym
+"sys_DICT"
+end ind
+
+
+ind attr
+"concept" "sys" "dict" "a"
+0
+"concept" "sys" "attrs" "common" "var"
+psym
+"dict_ALPHA"
+end ind
+
+
+ind attr
+"concept" "sys" "dict" "unknown"
+0
+"concept" "sys" "attrs" "common" "var"
+psym
+"dict_UNKNOWN"
+end ind
+
+
+quit
+
diff --git a/tests/analyzers/datum/kb/user/hier.kb b/tests/analyzers/datum/kb/user/hier.kb
new file mode 100644
index 0000000..e17d616
--- /dev/null
+++ b/tests/analyzers/datum/kb/user/hier.kb
@@ -0,0 +1,755 @@
+add empty
+add root
+add hier "concept" "gram"
+add hier "concept" "sys"
+add hier "concept" "sys" "attrs"
+add hier "concept" "sys" "attrs" "proxy"
+add hier "concept" "sys" "attrs" "proxy" "atom"
+add hier "concept" "sys" "attrs" "pproxy"
+add hier "concept" "sys" "attrs" "pproxy" "phrase"
+add hier "concept" "sys" "attrs" "common"
+add hier "concept" "sys" "attrs" "common" "var"
+add hier "concept" "sys" "attrs" "rule_elt"
+add hier "concept" "sys" "vals"
+add hier "concept" "sys" "vals" "boolean"
+add hier "concept" "sys" "vals" "boolean" "false"
+add hier "concept" "sys" "vals" "boolean" "true"
+add hier "concept" "sys" "nlp"
+add hier "concept" "sys" "nlp" "wht"
+add hier "concept" "sys" "nlp" "punct"
+add hier "concept" "sys" "nlp" "ctrl"
+add hier "concept" "sys" "nlp" "lex"
+add hier "concept" "sys" "nlp" "lex" "slot"
+add hier "concept" "sys" "nlp" "lex" "slot" "cases"
+add hier "concept" "sys" "mean"
+add hier "concept" "sys" "mean" "slot"
+add hier "concept" "sys" "mean" "slot" "case"
+add hier "concept" "sys" "mean" "slot" "case" "cap"
+add hier "concept" "sys" "mean" "slot" "case" "allcap"
+add hier "concept" "sys" "mean" "slot" "case" "mixed"
+add hier "concept" "sys" "mean" "slot" "mixed"
+add hier "concept" "sys" "dict"
+add hier "concept" "sys" "dict" "a"
+add hier "concept" "sys" "dict" "a" "A"
+add hier "concept" "sys" "dict" "a" "A" "A"
+add hier "concept" "sys" "dict" "a" "A" "Aa"
+add hier "concept" "sys" "dict" "a" "A" "Ab"
+add hier "concept" "sys" "dict" "a" "A" "Ac"
+add hier "concept" "sys" "dict" "a" "A" "Ad"
+add hier "concept" "sys" "dict" "a" "A" "Ae"
+add hier "concept" "sys" "dict" "a" "A" "Af"
+add hier "concept" "sys" "dict" "a" "A" "Ag"
+add hier "concept" "sys" "dict" "a" "A" "Ah"
+add hier "concept" "sys" "dict" "a" "A" "Ai"
+add hier "concept" "sys" "dict" "a" "A" "Aj"
+add hier "concept" "sys" "dict" "a" "A" "Ak"
+add hier "concept" "sys" "dict" "a" "A" "Al"
+add hier "concept" "sys" "dict" "a" "A" "Am"
+add hier "concept" "sys" "dict" "a" "A" "An"
+add hier "concept" "sys" "dict" "a" "A" "Ap"
+add hier "concept" "sys" "dict" "a" "A" "Aq"
+add hier "concept" "sys" "dict" "a" "A" "Ar"
+add hier "concept" "sys" "dict" "a" "A" "As"
+add hier "concept" "sys" "dict" "a" "A" "At"
+add hier "concept" "sys" "dict" "a" "A" "Au"
+add hier "concept" "sys" "dict" "a" "A" "Av"
+add hier "concept" "sys" "dict" "a" "A" "Aw"
+add hier "concept" "sys" "dict" "a" "A" "Ax"
+add hier "concept" "sys" "dict" "a" "A" "Ay"
+add hier "concept" "sys" "dict" "a" "A" "Az"
+add hier "concept" "sys" "dict" "a" "B"
+add hier "concept" "sys" "dict" "a" "B" "B"
+add hier "concept" "sys" "dict" "a" "B" "Ba"
+add hier "concept" "sys" "dict" "a" "B" "Be"
+add hier "concept" "sys" "dict" "a" "B" "Bi"
+add hier "concept" "sys" "dict" "a" "B" "Bl"
+add hier "concept" "sys" "dict" "a" "B" "Bo"
+add hier "concept" "sys" "dict" "a" "B" "Br"
+add hier "concept" "sys" "dict" "a" "B" "Bu"
+add hier "concept" "sys" "dict" "a" "B" "By"
+add hier "concept" "sys" "dict" "a" "C"
+add hier "concept" "sys" "dict" "a" "C" "C"
+add hier "concept" "sys" "dict" "a" "C" "Ca"
+add hier "concept" "sys" "dict" "a" "C" "Ce"
+add hier "concept" "sys" "dict" "a" "C" "Ch"
+add hier "concept" "sys" "dict" "a" "C" "Ci"
+add hier "concept" "sys" "dict" "a" "C" "Cl"
+add hier "concept" "sys" "dict" "a" "C" "Co"
+add hier "concept" "sys" "dict" "a" "C" "Cr"
+add hier "concept" "sys" "dict" "a" "C" "Cu"
+add hier "concept" "sys" "dict" "a" "C" "Cy"
+add hier "concept" "sys" "dict" "a" "D"
+add hier "concept" "sys" "dict" "a" "D" "D"
+add hier "concept" "sys" "dict" "a" "D" "Da"
+add hier "concept" "sys" "dict" "a" "D" "De"
+add hier "concept" "sys" "dict" "a" "D" "Di"
+add hier "concept" "sys" "dict" "a" "D" "Do"
+add hier "concept" "sys" "dict" "a" "D" "Dr"
+add hier "concept" "sys" "dict" "a" "D" "Du"
+add hier "concept" "sys" "dict" "a" "D" "Dy"
+add hier "concept" "sys" "dict" "a" "E"
+add hier "concept" "sys" "dict" "a" "E" "E"
+add hier "concept" "sys" "dict" "a" "E" "Ea"
+add hier "concept" "sys" "dict" "a" "E" "Eb"
+add hier "concept" "sys" "dict" "a" "E" "Ed"
+add hier "concept" "sys" "dict" "a" "E" "Ee"
+add hier "concept" "sys" "dict" "a" "E" "Ef"
+add hier "concept" "sys" "dict" "a" "E" "Eg"
+add hier "concept" "sys" "dict" "a" "E" "Eh"
+add hier "concept" "sys" "dict" "a" "E" "Ei"
+add hier "concept" "sys" "dict" "a" "E" "Ej"
+add hier "concept" "sys" "dict" "a" "E" "El"
+add hier "concept" "sys" "dict" "a" "E" "Em"
+add hier "concept" "sys" "dict" "a" "E" "En"
+add hier "concept" "sys" "dict" "a" "E" "Eo"
+add hier "concept" "sys" "dict" "a" "E" "Ep"
+add hier "concept" "sys" "dict" "a" "E" "Eq"
+add hier "concept" "sys" "dict" "a" "E" "Er"
+add hier "concept" "sys" "dict" "a" "E" "Es"
+add hier "concept" "sys" "dict" "a" "E" "Et"
+add hier "concept" "sys" "dict" "a" "E" "Eu"
+add hier "concept" "sys" "dict" "a" "E" "Ev"
+add hier "concept" "sys" "dict" "a" "E" "Ew"
+add hier "concept" "sys" "dict" "a" "E" "Ex"
+add hier "concept" "sys" "dict" "a" "E" "Ey"
+add hier "concept" "sys" "dict" "a" "E" "Ez"
+add hier "concept" "sys" "dict" "a" "F"
+add hier "concept" "sys" "dict" "a" "F" "F"
+add hier "concept" "sys" "dict" "a" "F" "Fa"
+add hier "concept" "sys" "dict" "a" "F" "Fe"
+add hier "concept" "sys" "dict" "a" "F" "Fi"
+add hier "concept" "sys" "dict" "a" "F" "Fl"
+add hier "concept" "sys" "dict" "a" "F" "Fo"
+add hier "concept" "sys" "dict" "a" "F" "Fr"
+add hier "concept" "sys" "dict" "a" "F" "Fu"
+add hier "concept" "sys" "dict" "a" "F" "Fy"
+add hier "concept" "sys" "dict" "a" "G"
+add hier "concept" "sys" "dict" "a" "G" "G"
+add hier "concept" "sys" "dict" "a" "G" "Ga"
+add hier "concept" "sys" "dict" "a" "G" "Ge"
+add hier "concept" "sys" "dict" "a" "G" "Gh"
+add hier "concept" "sys" "dict" "a" "G" "Gi"
+add hier "concept" "sys" "dict" "a" "G" "Gl"
+add hier "concept" "sys" "dict" "a" "G" "Gn"
+add hier "concept" "sys" "dict" "a" "G" "Go"
+add hier "concept" "sys" "dict" "a" "G" "Gr"
+add hier "concept" "sys" "dict" "a" "G" "Gu"
+add hier "concept" "sys" "dict" "a" "G" "Gy"
+add hier "concept" "sys" "dict" "a" "H"
+add hier "concept" "sys" "dict" "a" "H" "H"
+add hier "concept" "sys" "dict" "a" "H" "Ha"
+add hier "concept" "sys" "dict" "a" "H" "He"
+add hier "concept" "sys" "dict" "a" "H" "Hi"
+add hier "concept" "sys" "dict" "a" "H" "Ho"
+add hier "concept" "sys" "dict" "a" "H" "Hu"
+add hier "concept" "sys" "dict" "a" "H" "Hy"
+add hier "concept" "sys" "dict" "a" "I"
+add hier "concept" "sys" "dict" "a" "I" "I"
+add hier "concept" "sys" "dict" "a" "I" "Ia"
+add hier "concept" "sys" "dict" "a" "I" "Ib"
+add hier "concept" "sys" "dict" "a" "I" "Ic"
+add hier "concept" "sys" "dict" "a" "I" "Id"
+add hier "concept" "sys" "dict" "a" "I" "Ig"
+add hier "concept" "sys" "dict" "a" "I" "Il"
+add hier "concept" "sys" "dict" "a" "I" "Im"
+add hier "concept" "sys" "dict" "a" "I" "In"
+add hier "concept" "sys" "dict" "a" "I" "Io"
+add hier "concept" "sys" "dict" "a" "I" "Ir"
+add hier "concept" "sys" "dict" "a" "I" "Is"
+add hier "concept" "sys" "dict" "a" "I" "It"
+add hier "concept" "sys" "dict" "a" "J"
+add hier "concept" "sys" "dict" "a" "J" "J"
+add hier "concept" "sys" "dict" "a" "J" "Ja"
+add hier "concept" "sys" "dict" "a" "J" "Je"
+add hier "concept" "sys" "dict" "a" "J" "Ji"
+add hier "concept" "sys" "dict" "a" "J" "Jo"
+add hier "concept" "sys" "dict" "a" "J" "Ju"
+add hier "concept" "sys" "dict" "a" "K"
+add hier "concept" "sys" "dict" "a" "K" "K"
+add hier "concept" "sys" "dict" "a" "K" "Ka"
+add hier "concept" "sys" "dict" "a" "K" "Ke"
+add hier "concept" "sys" "dict" "a" "K" "Kh"
+add hier "concept" "sys" "dict" "a" "K" "Ki"
+add hier "concept" "sys" "dict" "a" "K" "Kl"
+add hier "concept" "sys" "dict" "a" "K" "Kn"
+add hier "concept" "sys" "dict" "a" "K" "Ko"
+add hier "concept" "sys" "dict" "a" "K" "Kr"
+add hier "concept" "sys" "dict" "a" "K" "Ku"
+add hier "concept" "sys" "dict" "a" "L"
+add hier "concept" "sys" "dict" "a" "L" "L"
+add hier "concept" "sys" "dict" "a" "L" "La"
+add hier "concept" "sys" "dict" "a" "L" "Le"
+add hier "concept" "sys" "dict" "a" "L" "Li"
+add hier "concept" "sys" "dict" "a" "L" "Ll"
+add hier "concept" "sys" "dict" "a" "L" "Lo"
+add hier "concept" "sys" "dict" "a" "L" "Lu"
+add hier "concept" "sys" "dict" "a" "L" "Ly"
+add hier "concept" "sys" "dict" "a" "M"
+add hier "concept" "sys" "dict" "a" "M" "M"
+add hier "concept" "sys" "dict" "a" "M" "Ma"
+add hier "concept" "sys" "dict" "a" "M" "Me"
+add hier "concept" "sys" "dict" "a" "M" "Mi"
+add hier "concept" "sys" "dict" "a" "M" "Mn"
+add hier "concept" "sys" "dict" "a" "M" "Mo"
+add hier "concept" "sys" "dict" "a" "M" "Mu"
+add hier "concept" "sys" "dict" "a" "M" "My"
+add hier "concept" "sys" "dict" "a" "N"
+add hier "concept" "sys" "dict" "a" "N" "N"
+add hier "concept" "sys" "dict" "a" "N" "Na"
+add hier "concept" "sys" "dict" "a" "N" "Ne"
+add hier "concept" "sys" "dict" "a" "N" "Ni"
+add hier "concept" "sys" "dict" "a" "N" "No"
+add hier "concept" "sys" "dict" "a" "N" "Nu"
+add hier "concept" "sys" "dict" "a" "N" "Ny"
+add hier "concept" "sys" "dict" "a" "O"
+add hier "concept" "sys" "dict" "a" "O" "O"
+add hier "concept" "sys" "dict" "a" "O" "Oa"
+add hier "concept" "sys" "dict" "a" "O" "Ob"
+add hier "concept" "sys" "dict" "a" "O" "Oc"
+add hier "concept" "sys" "dict" "a" "O" "Od"
+add hier "concept" "sys" "dict" "a" "O" "Oe"
+add hier "concept" "sys" "dict" "a" "O" "Of"
+add hier "concept" "sys" "dict" "a" "O" "Og"
+add hier "concept" "sys" "dict" "a" "O" "Oh"
+add hier "concept" "sys" "dict" "a" "O" "Oi"
+add hier "concept" "sys" "dict" "a" "O" "Ok"
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+add hier "concept" "sys" "dict" "a" "s" "sy"
+add hier "concept" "sys" "dict" "a" "t"
+add hier "concept" "sys" "dict" "a" "t" "t"
+add hier "concept" "sys" "dict" "a" "t" "ta"
+add hier "concept" "sys" "dict" "a" "t" "te"
+add hier "concept" "sys" "dict" "a" "t" "th"
+add hier "concept" "sys" "dict" "a" "t" "ti"
+add hier "concept" "sys" "dict" "a" "t" "to"
+add hier "concept" "sys" "dict" "a" "t" "tr"
+add hier "concept" "sys" "dict" "a" "t" "tu"
+add hier "concept" "sys" "dict" "a" "t" "tw"
+add hier "concept" "sys" "dict" "a" "t" "ty"
+add hier "concept" "sys" "dict" "a" "u"
+add hier "concept" "sys" "dict" "a" "u" "u"
+add hier "concept" "sys" "dict" "a" "u" "ua"
+add hier "concept" "sys" "dict" "a" "u" "un"
+add hier "concept" "sys" "dict" "a" "u" "up"
+add hier "concept" "sys" "dict" "a" "u" "ur"
+add hier "concept" "sys" "dict" "a" "v"
+add hier "concept" "sys" "dict" "a" "v" "v"
+add hier "concept" "sys" "dict" "a" "v" "va"
+add hier "concept" "sys" "dict" "a" "v" "ve"
+add hier "concept" "sys" "dict" "a" "v" "vi"
+add hier "concept" "sys" "dict" "a" "v" "vo"
+add hier "concept" "sys" "dict" "a" "v" "vu"
+add hier "concept" "sys" "dict" "a" "w"
+add hier "concept" "sys" "dict" "a" "w" "w"
+add hier "concept" "sys" "dict" "a" "w" "wa"
+add hier "concept" "sys" "dict" "a" "w" "we"
+add hier "concept" "sys" "dict" "a" "w" "wh"
+add hier "concept" "sys" "dict" "a" "w" "wi"
+add hier "concept" "sys" "dict" "a" "w" "wo"
+add hier "concept" "sys" "dict" "a" "w" "wr"
+add hier "concept" "sys" "dict" "a" "w" "wu"
+add hier "concept" "sys" "dict" "a" "x"
+add hier "concept" "sys" "dict" "a" "x" "x"
+add hier "concept" "sys" "dict" "a" "x" "xa"
+add hier "concept" "sys" "dict" "a" "x" "xe"
+add hier "concept" "sys" "dict" "a" "x" "xi"
+add hier "concept" "sys" "dict" "a" "x" "xo"
+add hier "concept" "sys" "dict" "a" "x" "xu"
+add hier "concept" "sys" "dict" "a" "x" "xy"
+add hier "concept" "sys" "dict" "a" "y"
+add hier "concept" "sys" "dict" "a" "y" "y"
+add hier "concept" "sys" "dict" "a" "y" "ya"
+add hier "concept" "sys" "dict" "a" "y" "ye"
+add hier "concept" "sys" "dict" "a" "y" "yi"
+add hier "concept" "sys" "dict" "a" "y" "yo"
+add hier "concept" "sys" "dict" "a" "y" "yu"
+add hier "concept" "sys" "dict" "a" "z"
+add hier "concept" "sys" "dict" "a" "z" "z"
+add hier "concept" "sys" "dict" "a" "z" "za"
+add hier "concept" "sys" "dict" "a" "z" "ze"
+add hier "concept" "sys" "dict" "a" "z" "zi"
+add hier "concept" "sys" "dict" "a" "z" "zo"
+add hier "concept" "sys" "dict" "a" "z" "zu"
+add hier "concept" "sys" "dict" "a" "z" "zy"
+add hier "concept" "sys" "dict" "0"
+add hier "concept" "sys" "dict" "0" "0"
+add hier "concept" "sys" "dict" "0" "0" "0"
+add hier "concept" "sys" "dict" "0" "0" "00"
+add hier "concept" "sys" "dict" "0" "0" "01"
+add hier "concept" "sys" "dict" "0" "0" "02"
+add hier "concept" "sys" "dict" "0" "0" "03"
+add hier "concept" "sys" "dict" "0" "0" "04"
+add hier "concept" "sys" "dict" "0" "0" "05"
+add hier "concept" "sys" "dict" "0" "0" "06"
+add hier "concept" "sys" "dict" "0" "0" "07"
+add hier "concept" "sys" "dict" "0" "0" "08"
+add hier "concept" "sys" "dict" "0" "0" "09"
+add hier "concept" "sys" "dict" "0" "1"
+add hier "concept" "sys" "dict" "0" "1" "1"
+add hier "concept" "sys" "dict" "0" "1" "10"
+add hier "concept" "sys" "dict" "0" "1" "11"
+add hier "concept" "sys" "dict" "0" "1" "12"
+add hier "concept" "sys" "dict" "0" "1" "13"
+add hier "concept" "sys" "dict" "0" "1" "14"
+add hier "concept" "sys" "dict" "0" "1" "15"
+add hier "concept" "sys" "dict" "0" "1" "16"
+add hier "concept" "sys" "dict" "0" "1" "17"
+add hier "concept" "sys" "dict" "0" "1" "18"
+add hier "concept" "sys" "dict" "0" "1" "19"
+add hier "concept" "sys" "dict" "0" "2"
+add hier "concept" "sys" "dict" "0" "2" "2"
+add hier "concept" "sys" "dict" "0" "2" "20"
+add hier "concept" "sys" "dict" "0" "2" "21"
+add hier "concept" "sys" "dict" "0" "2" "22"
+add hier "concept" "sys" "dict" "0" "2" "23"
+add hier "concept" "sys" "dict" "0" "2" "24"
+add hier "concept" "sys" "dict" "0" "2" "25"
+add hier "concept" "sys" "dict" "0" "2" "26"
+add hier "concept" "sys" "dict" "0" "2" "27"
+add hier "concept" "sys" "dict" "0" "2" "28"
+add hier "concept" "sys" "dict" "0" "2" "29"
+add hier "concept" "sys" "dict" "0" "3"
+add hier "concept" "sys" "dict" "0" "3" "3"
+add hier "concept" "sys" "dict" "0" "3" "30"
+add hier "concept" "sys" "dict" "0" "3" "31"
+add hier "concept" "sys" "dict" "0" "3" "32"
+add hier "concept" "sys" "dict" "0" "3" "33"
+add hier "concept" "sys" "dict" "0" "3" "34"
+add hier "concept" "sys" "dict" "0" "3" "35"
+add hier "concept" "sys" "dict" "0" "3" "36"
+add hier "concept" "sys" "dict" "0" "3" "37"
+add hier "concept" "sys" "dict" "0" "3" "38"
+add hier "concept" "sys" "dict" "0" "3" "39"
+add hier "concept" "sys" "dict" "0" "4"
+add hier "concept" "sys" "dict" "0" "4" "4"
+add hier "concept" "sys" "dict" "0" "4" "40"
+add hier "concept" "sys" "dict" "0" "4" "41"
+add hier "concept" "sys" "dict" "0" "4" "42"
+add hier "concept" "sys" "dict" "0" "4" "43"
+add hier "concept" "sys" "dict" "0" "4" "44"
+add hier "concept" "sys" "dict" "0" "4" "45"
+add hier "concept" "sys" "dict" "0" "4" "46"
+add hier "concept" "sys" "dict" "0" "4" "47"
+add hier "concept" "sys" "dict" "0" "4" "48"
+add hier "concept" "sys" "dict" "0" "4" "49"
+add hier "concept" "sys" "dict" "0" "5"
+add hier "concept" "sys" "dict" "0" "5" "5"
+add hier "concept" "sys" "dict" "0" "5" "50"
+add hier "concept" "sys" "dict" "0" "5" "51"
+add hier "concept" "sys" "dict" "0" "5" "52"
+add hier "concept" "sys" "dict" "0" "5" "53"
+add hier "concept" "sys" "dict" "0" "5" "54"
+add hier "concept" "sys" "dict" "0" "5" "55"
+add hier "concept" "sys" "dict" "0" "5" "56"
+add hier "concept" "sys" "dict" "0" "5" "57"
+add hier "concept" "sys" "dict" "0" "5" "58"
+add hier "concept" "sys" "dict" "0" "5" "59"
+add hier "concept" "sys" "dict" "0" "6"
+add hier "concept" "sys" "dict" "0" "6" "6"
+add hier "concept" "sys" "dict" "0" "6" "60"
+add hier "concept" "sys" "dict" "0" "6" "61"
+add hier "concept" "sys" "dict" "0" "6" "62"
+add hier "concept" "sys" "dict" "0" "6" "63"
+add hier "concept" "sys" "dict" "0" "6" "64"
+add hier "concept" "sys" "dict" "0" "6" "65"
+add hier "concept" "sys" "dict" "0" "6" "66"
+add hier "concept" "sys" "dict" "0" "6" "67"
+add hier "concept" "sys" "dict" "0" "6" "68"
+add hier "concept" "sys" "dict" "0" "6" "69"
+add hier "concept" "sys" "dict" "0" "7"
+add hier "concept" "sys" "dict" "0" "7" "7"
+add hier "concept" "sys" "dict" "0" "7" "70"
+add hier "concept" "sys" "dict" "0" "7" "71"
+add hier "concept" "sys" "dict" "0" "7" "72"
+add hier "concept" "sys" "dict" "0" "7" "73"
+add hier "concept" "sys" "dict" "0" "7" "74"
+add hier "concept" "sys" "dict" "0" "7" "75"
+add hier "concept" "sys" "dict" "0" "7" "76"
+add hier "concept" "sys" "dict" "0" "7" "77"
+add hier "concept" "sys" "dict" "0" "7" "78"
+add hier "concept" "sys" "dict" "0" "7" "79"
+add hier "concept" "sys" "dict" "0" "8"
+add hier "concept" "sys" "dict" "0" "8" "8"
+add hier "concept" "sys" "dict" "0" "8" "80"
+add hier "concept" "sys" "dict" "0" "8" "81"
+add hier "concept" "sys" "dict" "0" "8" "82"
+add hier "concept" "sys" "dict" "0" "8" "83"
+add hier "concept" "sys" "dict" "0" "8" "84"
+add hier "concept" "sys" "dict" "0" "8" "85"
+add hier "concept" "sys" "dict" "0" "8" "86"
+add hier "concept" "sys" "dict" "0" "8" "87"
+add hier "concept" "sys" "dict" "0" "8" "88"
+add hier "concept" "sys" "dict" "0" "8" "89"
+add hier "concept" "sys" "dict" "0" "9"
+add hier "concept" "sys" "dict" "0" "9" "9"
+add hier "concept" "sys" "dict" "0" "9" "90"
+add hier "concept" "sys" "dict" "0" "9" "91"
+add hier "concept" "sys" "dict" "0" "9" "92"
+add hier "concept" "sys" "dict" "0" "9" "93"
+add hier "concept" "sys" "dict" "0" "9" "94"
+add hier "concept" "sys" "dict" "0" "9" "95"
+add hier "concept" "sys" "dict" "0" "9" "96"
+add hier "concept" "sys" "dict" "0" "9" "97"
+add hier "concept" "sys" "dict" "0" "9" "98"
+add hier "concept" "sys" "dict" "0" "9" "99"
+add hier "concept" "sys" "dict" "A"
+add hier "concept" "sys" "dict" "wht"
+add hier "concept" "sys" "dict" "pnct"
+add hier "concept" "sys" "dict" "ctrl"
+add hier "concept" "sys" "dict" "unknown"
+
+quit
+
diff --git a/tests/analyzers/datum/kb/user/phr.kb b/tests/analyzers/datum/kb/user/phr.kb
new file mode 100644
index 0000000..3b3c7fc
--- /dev/null
+++ b/tests/analyzers/datum/kb/user/phr.kb
@@ -0,0 +1,3 @@
+
+quit
+
diff --git a/tests/analyzers/datum/kb/user/word.kb b/tests/analyzers/datum/kb/user/word.kb
new file mode 100644
index 0000000..36151ce
--- /dev/null
+++ b/tests/analyzers/datum/kb/user/word.kb
@@ -0,0 +1,57 @@
+add word "
+"
+add word "	"
+add word " "
+add word ">"
+add word "<"
+add word "/"
+add word "\\"
+add word "|"
+add word "]"
+add word "["
+add word "}"
+add word "{"
+add word "+"
+add word "="
+add word "_"
+add word "-"
+add word ")"
+add word "("
+add word "*"
+add word "&"
+add word "^"
+add word "%"
+add word "$"
+add word "#"
+add word "@"
+add word "`"
+add word "~"
+add word "?"
+add word "!"
+add word "\""
+add word "'"
+add word ":"
+add word ","
+add word "."
+add word ";"
+add word "closed"
+add word "constrain"
+add word "dirty"
+add word "gen"
+add word "lit"
+add word "locked"
+add word "quicksem"
+add word "split"
+add word "xwhite"
+add word active
+add word algo
+add word building
+add word comment
+add word data
+add word pass
+add word passnum
+add word state
+add word type
+
+quit
+
diff --git a/tests/analyzers/datum/spec/analyzer.seq b/tests/analyzers/datum/spec/analyzer.seq
new file mode 100644
index 0000000..bd07841
--- /dev/null
+++ b/tests/analyzers/datum/spec/analyzer.seq
@@ -0,0 +1,3 @@
+#
+tokenize	nil	# Gen:   Convert input to token list
+nlp	datum	# Echo G("$datum") to the output buffer
diff --git a/tests/analyzers/datum/spec/datum.nlp b/tests/analyzers/datum/spec/datum.nlp
new file mode 100644
index 0000000..0aa7624
--- /dev/null
+++ b/tests/analyzers/datum/spec/datum.nlp
@@ -0,0 +1,7 @@
+# Echoes the datum the caller passed to analyze(), or "none".
+@CODE
+if (G("$datum"))
+  cbuf() << G("$datum");
+else
+  cbuf() << "none";
+@@CODE
diff --git a/tests/data/emailaddress/text.txt_log/output.json b/tests/data/emailaddress/text.txt_log/output.json
index d14eb3e..da87358 100644
--- a/tests/data/emailaddress/text.txt_log/output.json
+++ b/tests/data/emailaddress/text.txt_log/output.json
@@ -63,10 +63,14 @@
       {
         "id": "10",
         "local": "kenethfpp",
-        "tld": "yahoo"
+        "subdomain": "mails",
+        "domainname": "yahoo",
+        "cd": "uk",
+        "country": "UnitedKingdom"
       },
       {
         "id": "11",
+        "local": "charitysc123",
         "domainname": "243",
         "tld": "org"
       },
diff --git a/tests/test_engine.py b/tests/test_engine.py
index e3c3c83..36eea3e 100644
--- a/tests/test_engine.py
+++ b/tests/test_engine.py
@@ -85,6 +85,25 @@ def test_links_parser(self):
         self._run_analyzer("links")
 
 
+class DatumTest(TestCase):
+    """analyze(datum=...) reaches the analyzer as G("$datum") (issue #1)."""
+
+    def test_datum(self):
+        with TemporaryDirectory(prefix="test-nlpplus", ignore_cleanup_errors=True) as tmp:
+            copytree(DATADIR.parent / "analyzers", Path(tmp) / "analyzers")
+            copytree(NLPPLUSDIR / "data", Path(tmp) / "data")
+            try:
+                NLPPlus.set_working_folder(tmp)
+                analyze = NLPPlus.engine.analyze
+                self.assertEqual(analyze("x", "datum", datum="json").output_text, "json")
+                self.assertEqual(analyze("x", "datum", datum="xml").output_text, "xml")
+                # Each call sets its own: none carries over from the last.
+                self.assertEqual(analyze("x", "datum").output_text, "none")
+            finally:
+                NLPPlus.engine.close()
+                NLPPlus.engine = NLPPlus.Engine()
+
+
 class ReentrancyRegressionTest(TestCase):
     """nlp-engine #658 / #632 regression.