OPC-Binary-Schema and XML-Schema

[_Sadako_]

According to the CPX-specification OPC defines two type-systems to produce type-descriptions: XML-Schema and OPC-Binary-Schema.
If I look at appendix A in the CPX-specification it seems to me (an absolutely XML-noob) that the "construction" of the OPC-Binary-Schema is the same as the "construction" of a XML-Schema. Could one say that OPC-Binary-Schema IS A XML-Schema or is it nonsense saying that.
But if it isn't nonsense OPC defines only one type-system: XML-Schema.
I hope that someone could answer this question cause i need this information for my degree dissertation and it seems that I'm not able to find it out for myself...
Another question: must type-systems for OPC-CPX always base on XML?
If not: What's an example for another type-system?
thx!

_Sadako_

[Randy]

XML Schema is an XML based syntax for describing data encoded as XML text.

OPC Binary is an XML base syntax for describing data encoded as a binary stream.

The OPC Binary exists to support existing devices that use a well defined binary format (such as Foundation Field Bus) that they wish to expose via OPC.

Anyone creating a server from scratch should use XML Schema because that is more interoperable solution.

Regards