encoding/xml: allow overriding by empty namespace

The namespace defined by xmlns="value" can be overridden in every included tag
by the empty namespace xmlns="" without a prefix.

Method to calculate indent of XML handles depth of tag and its associated namespace is
still active even when no indent is required.

An XMLName field in a struct means that namespace must be enforced even if empty.
This occurs only on an inner tag as an override of any non-empty namespace of its outer tag.
An attribute is added to have the required namespace display.

Fixes #7113

Change-Id: I57f2308e98c66f04108ab136d350bdc3a6091e98
Reviewed-on: https://go-review.googlesource.com/c/go/+/108796
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@google.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
Auto-Submit: Ian Lance Taylor <iant@google.com>
2 files changed
tree: 3ebcd0a04d5bbf2fc0ebf3088822c45e21a08954
  1. .github/
  2. api/
  3. doc/
  4. lib/
  5. misc/
  6. src/
  7. test/
  8. .gitattributes
  9. .gitignore
  10. codereview.cfg
  11. CONTRIBUTING.md
  12. go.env
  13. LICENSE
  14. PATENTS
  15. README.md
  16. SECURITY.md
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