Don't use "transaction" as the name of your root node in an XML schema

Especially if you ever hope to integrate with someone who uses BizTalk. Apparently, "transaction" is an XLANG/s reserved keyword in BizTalk 2004.

This is the type of error to expect in BizTalk...

MyOrchestration.odx(92,52):
error X2254: unexpected keyword: 'transaction'
error X2011: expected 'identifier'
error X2016: unexpected token: '.'
error X2157: '': a part of a non-method messagetype must be of class type

See this msdn article for all of the XLANG/s reserved keywords...
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/sdk/htm/ebiz_prog_orch_nozn.asp

This also led to me figuring out what that language is that BizTalk uses in the expression editor...

Comparing XLANG/s and C#