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There appears to be a discrepancy between the lexical representation of gMonth in the "XML Schema: Datatypes" recommendation and the truncated representation of a month described in 5.2.1.3 of ISO 8601:1988. The former indicates that the lexical representation is "--MM--", while the latter specifies the truncated representation as "--MM". See http://lists.w3.org/Archives/Public/www-xml-schema-comments/2001JulSep/0094.html
The WG has agreed this is an error. Errata E0-15 and E2-12 added.