nxml-parent-document

nxml-parent-document is a variable defined in `nxml-mode.el'.
Its value is

nil

• Automatically becomes buffer-local when set.
• This variable is safe as a file local variable if its value
  satisfies the predicate `stringp'.

Documentation:
The parent document for a part of a modular document.
Use `nxml-parent-document-set' to set it.