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gh-156388: Docs: clarify DocumentType identifiers #157646

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Docs: clarify DocumentType identifiers
Neiland85 Sep 16, 2026
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Merge remote-tracking branch 'upstream/main' into docs-xml-dom-156388
Neiland85 Sep 26, 2026
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12 changes: 11 additions & 1 deletion Doc/library/xml.dom.rst
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Expand Up @@ -571,13 +571,23 @@ following attributes:
.. attribute:: DocumentType.publicId

The public identifier for the external subset of the document type definition,
or ``None`` if the ``DOCTYPE`` declaration does not specify it.
or ``None`` if the ``DOCTYPE`` declaration does not specify it. A ``PUBLIC``
``DOCTYPE`` declaration always has both a public and a system identifier.


.. attribute:: DocumentType.systemId

The system identifier, a URI, for the external subset of the document type
definition, or ``None`` if the ``DOCTYPE`` declaration does not specify it.
A ``SYSTEM`` ``DOCTYPE`` declaration has a system identifier but no public
identifier.

For a parsed XML document, ``publicId`` and ``systemId`` correspond to the
external identifier in the ``DOCTYPE`` declaration: both are non-``None`` for
a ``PUBLIC`` declaration, only ``systemId`` is non-``None`` for a ``SYSTEM``
declaration, and both are ``None`` when there is no external identifier.
:meth:`DOMImplementation.createDocumentType` does not validate the identifiers,
so programmatically created objects may have other combinations.


.. attribute:: DocumentType.internalSubset
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