xml.dom.minidom uses names from superseded drafts of DOM Level 3

Several public attributes and methods of xml.dom.minidom come from working drafts of DOM Level 3, and were renamed before the Recommendation was published in 2004. The code says so itself:

# DOM Level 3 attributes, based on the 22 Oct 2002 draft
# DOM Level 3 (WD 9 April 2002)

Document.errorHandler is from the same drafts; in the Recommendation it became a parameter of domConfig.

None of these names are documented, so nothing tells a user that they are neither DOM Level 1/2 (which xml.dom documents) nor DOM Level 3 (which minidom does not claim, see gh-50348).

Adding the specified names and keeping the old ones as aliases breaks nothing, and lets the documented API match the specification.

Linked PRs

• gh-156696

從 xml.dom.minidom 入口點開始，檢查 issue 中列出的公開屬性與方法，以及它們的 DOM Level 3 註解。將每個目前的名稱與 Recommendation 中指定的名稱進行比較；當指定的名稱可作為別名使用且不會破壞舊名稱，並且現有測試中有適當的涵蓋時，即表示完成。