In 10.4.8.1 op:gMonth-equal() the first example is missing a close paren: op:gMonth-equal(xs:gMonth("--12-14:00"), xs:gMonth("--12+10:00") should read op:gMonth-equal(xs:gMonth("--12-14:00"), xs:gMonth("--12+10:00"))
Erratum E40 has been drafted to correct this example. The bug is therefore being marked fixed and closed.