Is the XML Schema for XML Digital Signatures needed?

Hi Folks,

Let me try the following argument on you. Please tell me if there are flaws in my argument.

The XML Schema for XML Digital Signatures may be found at this URL:

https://www.w3.org/TR/2002/REC-xmldsig-core-20020212/xmldsig-core-schema.xsd  

I would like to argue that it (the XML Schema) is not needed. 

Why? 

Because digital signature tools won't work if an XML Digital Signature is not properly constructed. XML Digital Signatures are implicitly validated by digital signature tools. Therefore, the XML Schema for XML Digital Signature is not needed.

Thoughts?

/Roger