PhpStorm brings powerful XML editing support that includes:
Validation and syntax highlighting.
Code completion Ctrl+Space.
Indentation (Ctrl+Alt+I, Ctrl+Alt+L).
Intention actions Alt+Enter.
Viewing code structure Alt+7.
Navigation in the source code Ctrl+B.
Integrated documentation Ctrl+Q.
Search for usages Alt+F7.
Lines of code (Ctrl+/, Ctrl+Shift+/).
Unwrapping and removing tags Ctrl+Shift+Delete.
Generating schemas from instance documents and vice versa.
PhpStorm uses Xerces 2.11, an XML parser developed by Apache Software Foundation Group.
To import an XML namespace
Open the desired file for editing, and start typing a tag. If a namespace is not bound, the following prompt appears:
Press Alt+Enter. If there are multiple choices, select the desired namespace from the list. PhpStorm creates a namespace declaration.
Configuring syntax highlighting
You can configure XML-aware syntax highlighting according to your preferences and habits.
Select the color scheme, accept the highlighting settings inherited from defaults or customize them as described in Configuring Colors and Fonts.