How can I access the XSD from URN given below?

Question

Document xmlns="urn:iso:std:iso:20022:tech:xsd:camt.054.001.04" >xmlns:xs="http://www.w3.org/2001/XMLSchema" >

.. and so on..

Answer 1

A namespace is just a unique identifier, it doesn't tell you the location of a schema. This is always true, but it's especially true when the namespace is a URN, which is deliberately designed to hold no location information.

So the only way to find a schema for that namespace is to search for it on the web, or in your local public library, or wherever you normally look for such things.