Attribute declaration is resolved for attribute use. (valid schema)

Attribute declaration is resolved for attribute use. (valid schema) Attribute use should has proper ref value to be resolved to its declaration. Attribute declaration is resolved for attribute use. (invalid schema) Attribute use should has proper ref value to be resolved to its declaration. Attribute use is declared required. (valid schema) Element whose attribute use is declared required should has the attribute specified. Attribute with fixed value is declared within element by reference (valid schema) Attribute declared with fixed value may not have another value in an instance document.