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In tree editor should all element and attibute customizers allow do display and modify their namespace. It should be constrained by document grammar if it exist. The default namespace must be treated. Allow namespace filtering.
It text editor can be introduce a special color for namespace related stuff: prefixes and xmlns family of attributes.
I would add another feature to editor: When there are multiple namespaces, render content from different namespaces in different colors. When this coloring is enabled, optionally hide namespace prefixes. There should be a control for switching namespaces (color) of currently edited stuff. That would save us reading and writing prefixes all around while maintaining correctness and improving readability.
[For future support of Namespaces in text editor created feature issue #16680.]
Let these are considered while planning next release.
Target milestone was changed from not determined to TBD
XML tree editor is not part of NetBeans since 3.5 version. No plans to bring it back.
Verified - fixed long time ago