importing xml schema

when trying to create a record using an xml schema as the source for the format, i get the following error:

Couldn’t compile
[B2BCORE.0082.9803] c:\schema.xsd - this schema definition is written using syntaxes from the W3C XML Schema Proposed Recommendation drafts, dated March 2001 or later. B2B does not support this version and will support it in the near future.

are there any workarounds for this? we’re using b2b 4.0.2. is this something that is resolved in 4.6 or 6.0?