Poor diagnostic - identifier of schema component having error uses "group[4]"

[warning] Schema Definition Warning: Section_3 is an optional element or a variable-occurrence array and its alignment (1) is not the same as group[4]'s alignment (8).

In the schema associated with this message, there is only one group definition, and the group reference referring to it is the 4th child of the enclosing element, but it is a xs:sequence with dfdl:hiddenGroupRef.

Referring to this as "group[4]" is not helpful. Some sort of schema component ID, or an XPath that identifies the component at issue usefully is required.