The {type definition} of an attribute is a simple type (au-props-correct /
src-attribute). An attribute whose type resolves to a complex type, or to the
complex ur-type xs:anyType, is now rejected; a built-in or user simple type,
an inline simpleType, or no type (anySimpleType) stays valid. A locally-
declared type takes precedence over the built-in reading, consistent with the
src-ct rules.
Strictly zero false positive: an attribute can never carry a complex type, so
no valid schema is affected. XSTS: invalid-schemas-accepted 96 to 95 (attD002),
valid-schemas-rejected held at 0, no other bucket moved. Differential:
PureXML-stricter unchanged at 87 over 9618 schemas.