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In transform-expr-043, the expression $var1 instance of xs:untyped, $var1/TITLE[1] instance of xs:untyped should be $var1 instance of element(*, xs:untyped), $var1/TITLE[1] instance of element(*, xs:untyped)
A similar error occurs in transform-expr-050
Agreed. I've changed both transform-expr-043 and transform-expr-050.