Hi, I have a project to implement RFC4930 (EPP). The RFC provides two schemas that define the XML formats for the messages passed in the emplementation: http://www.faqs.org/rfcs/rfc4930.html The schemas are in section 4 (Formal Syntax), paras 1 and 2. I've created an oXygen project for this, and added two files: one for the "Base Schema", and one for the "Shared Structure" schema. I've called these, respectively: * Rfc4930.xsd * Rfc4930Types.xsd However, the former (Rfc4930.xsd) will not validate in oXygen. Saxon gives a warning: SystemID: C:\Projects\RFC4930\Rfc4930.xsd Location: 8:60 Description: [SaxonSA] Cannot locate a schema for namespace urn:ietf:params:xml:ns:eppcom-1.0 This is followed by two errors: SystemID: C:\Projects\RFC4930\Rfc4930.xsd Location: 181:0 Description: [SaxonSA] The type {clIDType} is referenced, but has not been declared SystemID: C:\Projects\RFC4930\Rfc4930.xsd Location: 300:0 Description: [SaxonSA] The type {minTokenType} is referenced, but has not been declared I guess that the errors are occurring because the schema cannot be found. Can anyone explain to me what I have to do to get the types declared? I tried including the types document in the base schema, but that didn't help things. I guess the problem is fairly straightforward, but it appears nevertheless to be beyond me. Thanks in advance Peter