xml.dom.minidom: the DOM Level 3 Load and Save API is mostly unimplemented

Every xml.dom.minidom document inherits DocumentLS, and most of it raises NotImplementedError:

>>> doc.load("x")
NotImplementedError: haven't written this yet
>>> doc.loadXML("<a/>")
NotImplementedError: haven't written this yet
>>> doc.abort()
NotImplementedError: haven't figured out what this means yet
>>> minidom.getDOMImplementation().createDOMWriter()
NotImplementedError: the writer interface hasn't been written yet!

Only saveXML(), createDOMBuilder() and createDOMInputSource() work. DocumentLS also defines _get_async() and _set_async(), where the setter should reject asynchronous loading, but they are never made a property, so async_ is a plain class attribute and doc.async_ = True silently succeeds.

The names come from a working draft. The final Recommendation defines LSParser, LSSerializer, LSInput, LSOutput, LSResourceResolver, LSParserFilter and DOMImplementationLS with createLSParser(), createLSSerializer(), createLSInput() and createLSOutput(), and defines no DocumentLS, DOMBuilder, DOMWriter, DOMEntityResolver or DOMInputSource at all.

Nothing of this is documented -- xml.dom.xmlbuilder has no documentation page, and DocumentLS, DOMImplementationLS, DOMBuilderFilter and Options are not in its __all__ -- and there is no successor in the WHATWG DOM Standard, where parsing and serialization are DOMParser and XMLSerializer in the HTML Standard.

So the question is whether to implement the missing parts, deprecate the whole feature, or leave it and document it as unimplemented. See also gh-152142 about DOMBuilderFilter.

Linked PRs

• gh-156735

Beginne mit der Überprüfung von xml.dom.minidom.DocumentLS und xml.dom.xmlbuilder und vergleiche anschließend ihre APIs mit der verlinkten DOM Level 3 Load and Save Recommendation. Prüfe gh-156735 und gh-152142, bevor du entscheidest, ob die betroffenen Schnittstellen implementiert, als veraltet markiert oder als nicht implementiert dokumentiert werden sollten; für den Abschluss sind eine abgestimmte Richtung und entsprechende Projektänderungen erforderlich.