Much as different languages have different rules of grammar, the code you use can have different rules depending on the doctype you use.
Your doctype is setting the language you’re using and code that’s valid under one doctype may not be valid using another.
For instance the inclusion of a space in the element name To make sure a SOAP message looks exactly how it should, you should validate it against all the schemas that are referenced in that message.
In your example, that's SOAP, WS-Addressing, and schema for the custom namespace (my Service).
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