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The prose of the spec and the schema for schemas are at odds with each other for all of the unsigned numeric types. The prose says the lexical forms of these types contain nothing but digits, but the schema for schemas defines no pattern outlawing signs. Either a pattern should be added, or the prose should be changed. The implementations I've checked mostly follow the schema for schemas; if this is true for other implementations as well, then the prose should be changed, both in 1.0 and in 1.1. See bug 1834 for resolution of this issue in schema 1.1.