Magento2 – Custom XML Schema Validation

magento2validationxml

This is a follow up of Magento 2 xml validation:
I understood how to map xsi:noNamespaceSchemaLocation in my IDE so I will get real time validation of my xmls.
But what if I have to create my own config file with it's own validation schema?
What value should I put for xsi:noNamespaceSchemaLocation ?

Right now I have this in class.xml:

<?xml version="1.0"?>
<classes xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="class.xsd">
   ....
</classes>

This works nicely, because class.xsd is in the same folder as my class.xml.
But I plan to make my module extensible and actually composed from multiple modules.
Now I use in the additional modules a relative path to the class.xsd file and this seams a bit wrong. 

<?xml version="1.0"?>
<classes xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../../../Base/etc/umc/class.xsd">
   ....
</classes>

Obviously I cannot use urn:magento:framework... because my module is not in the framework, and I also cannot use urn:magento:module... because mine is not a core module. Or can I use the latter?
Or should I use a custom urn?
And (last one) if I use a custom urn will this be picked up automatically by the command bin/magento dev:urn-catalog:generate or should I dos something special?

Best Answer

It should be urn:magento:module:<Vendor_Module>:<path> The command will work since it filters out urns that begin with urn:magento https://github.com/magento/magento2/blob/2.2-develop/app/code/Magento/Developer/Console/Command/XmlCatalogGenerateCommand.php#L118

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