Bug in Daffodil? No error with dfdl:initiatedContent="yes" and dfdl:initiator="%ES;"

[Costello, Roger L.]

The specification says this:

If the ES entity or the WSP* entity appear alone as one of the string literals 
in the list, then dfdl:initiatedContent must be "no" .

Below is a DFDL schema with dfdl:initiatedContent="yes" and 
dfdl:initiator="%ES;". No error is generated on parsing. Is this a bug?   /Roger

<xs:element name="input">
   <xs:complexType>
        <xs:sequence dfdl:initiatedContent="yes">
            <xs:element name="A" type="xs:string" dfdl:initiator="%ES;" />
        </xs:sequence>
    </xs:complexType>
</xs:element>