How to use

Add the applicable scheme to the xml files. For example, for the code_scheme element, change:

<code_scheme name="Default" version="X">
  ...
</code_scheme>

to

<code_scheme name="Default" version="X"
             xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
             xsi:noNamespaceSchemaLocation="https://raw.githubusercontent.com/PrinsFrank/phpstorm-settings-xsd/master/code_scheme.xsd">
  ...
</code_scheme>