XSD
From Friend2Friend Wiki
XSD is a complex, widely used XML schema language (i.e. a way of defining XML datatypes) that became a W3C recommendation in 2001. It is one of 2 XML schema languages in widespread use (the other being RNG, which is simpler and almost as flexible). W3C is in the processing of issuing a v1.1.
Relationship to F2F
The F2F core creates XSDs for each of the core services which is uses to check that they are invoked correctly.
All modules have their own XSD schema, with their unique URI as its targetNamespace, used to define any XML particular to that module. Any XML elements specified in that module's schema may be referred to in the module definition by using an XSD-style reference, i.e. ref="my-module:example-item".
