In order to format and to perform schema validation of XML files or text in Notepad++ you will need to make use of the XML Tools plugin which you can download using the Plugins Admin...,
Steps to install XML Tools
- Go to Menu: Plugins -> Plugin Admin...
- Search for XML Tools,
- Click on Install,
- Notepad++ will restart,
- Now under Plugins you should see an option of XML Tools,

Small set of useful tools for editing XML.
The plugin is MSXML-based.
The features are:
- XML syntax Check
- XML Schema (XSD) + DTD Validation
- XML tag autoclose
- Pretty print
- Linarize XML
- Current XML Path
- Conversion XML <-> Text
- Comment / Uncomment
- XPath expression evaluation
Author: Nicolas Crittin
Homepage: https://github.com/morbac/xmltools
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