s:lowercaseName is also used in

CastAs-UnionType-22
CastAs-UnionType-23
CastAs-UnionType-24

We now allow casting from string and untypedAtomic to any simple type other than the abstract types xs:anySimpleType and xs:NOTATION, with semantics equivalent to validation.

Thanks.

Can you clarify why a constructor function is expected for s:lowercaseName?

http://www.w3.org/TR/xquery-30/#id-constructor-functions

"For every generalized atomic type in the in-scope schema types (except xs:NOTATION and xs:anyAtomicType, which are not instantiable), a constructor function is implicitly defined."

[Definition: A generalized atomic type is a type which is either (a) an atomic type or (b) a pure union type ].

[Definition: A pure union type is an XML Schema union type that satisfies the following constraints: (1) {variety} is union, (2) the {facets} property is empty, .....

s:lowercaseName has facets so it isn't a pure union type or a generalized atomic type.  The test description is "Constructor function for union type with facets".

Am I missing something?

I may have found it in 4.11 Schema Import:

"For each named user-defined simple type in the schema, schema import also adds a corresponding constructor function. "

Also F+O 18.5: For every user-defined simple type in the static context (See Section 2.1.1 Static Context XP31), there is a constructor function whose name is the same as the name of the type and whose effect is to create a value of that type from the supplied argument. 

But XPath 3.14.4 has it wrong: "For every generalized atomic type in the in-scope schema types (except xs:NOTATION and xs:anyAtomicType, which are not instantiable), a constructor function is implicitly defined."

Thanks.  I just noticed that bug 28915 already addresses this.  I am changing this test suite bug back to INVALID since the issue is in the specification.