Dik Takken 6dac6a996e Warning promotion: Throw on writing invalid XML tag names ...

This change throws a ValueError when an invalid tag name is passed
to XMLWriter.

The rationale is that this indicates a programming error because
tag names typically originate from string literals or application
code generating them. This translates into either a typo or a flaw
in tag generation logic.

Closes GH-6233.

2020-09-29 16:52:47 +02:00

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