I try perform XQuery test request 
    doc("data:application/xml,%3Ce%2F%3E")   (:<e/>:)

Saxon gives out the following message:
    FODC0002: Exception thrown by URIResolver: ═х Ёрёяючэрэ яЁхЇшъё URI.
    Query processing failed: Run-time errors were reported

Tell me please what's wrong?