The span id is attached to the note whenever possible

margin-notes/README.md

@@ -29,6 +29,7 @@ The preceding configuration can be applied to the following sample:
 [BibTeX]{.term
   lem=BibTeX
   def="A program designed to format bibliographical entries"
+  #bibtex
 } citations. Note that in LaTeX environments,
 the material between the begin and end tags will be interpreted
 as [raw LaTeX]{.term
@@ -37,6 +38,8 @@ as [raw LaTeX]{.term
 }, not as Markdown.
 ```
 
+In LaTeX and ConTeXt, if the span has an identifier (like `#bibtex` above), it will be used as the label of the note.
+
 For DOCX output, the note is set as the content of a tooltip attached to an asterisk following the body text. Since this does not always produce good results, notably because tooltips only display plain strings, DOCX output is deactivated by default. However, you can activate it for individual classes by setting the variables `docx-body-text` and `docx-note-text`:
 
 ``` yaml

margin-notes/margin-notes.lua

@@ -491,13 +491,22 @@ end
 
 local i_invocation = 0
 
-local function wrap_in_raw_note_code(content, class_name)
+local function wrap_in_raw_note_code(content, class_name, id)
   -- content is a List of Inlines (output of replace_placeholders)
   local margin_note = content
   if FORMAT == 'context' or FORMAT == 'latex' then
     local csname = config[class_name].csname or 'mrgnn'
-    insert_in_table(margin_note, 1, pandoc.RawInline(FORMAT, '\\' .. csname .. '{'))
-    insert_in_table(margin_note, pandoc.RawInline(FORMAT, '}'))
+    local before = '\\' .. csname
+    if id ~= '' and FORMAT == 'context' then
+      before = before .. '[' .. id .. ']'
+    end
+    before = before .. '{'
+    if id ~= '' and FORMAT == 'latex' then
+      before = before .. '\\label{' .. id .. '}'
+    end
+    local after = '}'
+    insert_in_table(margin_note, 1, pandoc.RawInline(FORMAT, before))
+    insert_in_table(margin_note, pandoc.RawInline(FORMAT, after))
   elseif FORMAT == 'openxml' then
     i_invocation = i_invocation + 1
     local bookmark_id = 'mrgnn_' .. i_invocation
@@ -531,11 +540,12 @@ local function render_margin_notes(span)
       local render_note = config[class_name].render.note
       local render_body = config[class_name].render.body
       local note_position = config[class_name].position
+      local note_id = span.identifier
       local margin_note = {}
       local body = {}
       if render_note then
         margin_note = wrap_in_raw_note_code(
-          render_note(span.content, span.attributes), class_name)
+          render_note(span.content, span.attributes), class_name, note_id)
       end
       if render_body then
         body = render_body(span.content, span.attributes)
@@ -553,6 +563,9 @@ local function render_margin_notes(span)
               'the margin-note class "' .. class_name '". ' ..
               'Expected "before" or "after".')
       end
+      if FORMAT == 'context' or FORMAT == 'latex' then
+        span.identifier = '' -- The id is attached to the note.
+      end
       return span_with_note
     end
   end

margin-notes/sample.md

@@ -14,6 +14,7 @@ mrgnn-define-renderings:
 [BibTeX]{.term
   lem=BibTeX
   def="A program designed to format bibliographical entries"
+  #bibtex
 } citations. Note that in LaTeX environments,
 the material between the begin and end tags will be interpreted
 as [raw LaTeX]{.term

margin-notes/test/sample.native

@@ -14,7 +14,7 @@
     , Str "include"
     , SoftBreak
     , Span
-        ( ""
+        ( "bibtex"
         , [ "term" ]
         , [ ( "lem" , "BibTeX" )
           , ( "def"