The existence of numerous independent, interoperable implementations shows the vitality of a protocol. In fact, the existence of such implementations is a key criterion for advancing beyond the first rung of the IETF standardization ladder.
Explicit interoperability testing has been performed for Canonical XML, XMLDSIG, XML Encryption, and Exclusive XML Canonicalization. Furthermore, several sources have indicated the availability of toolkits, software development kits (SDKs), source code, or test vectors for these standards and XKMS.
The latest Canonical XML interoperability matrix is found at
and is linked off the XMLDSIG Working Group site [XMLDSIG ...