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In fn/transform.xml, test-case "fn-transform-1b" has an (unintended) syntax error in the test query. It ends with: ... return EXPR castable as node() but the right-hand operand of 'castable as' is a SingleType, where SingleType ::= SimpleTypeName "?"? SimpleTypeName ::= TypeName TypeName ::= EQName so "node()" is not valid there.
Changed "castable as" to "instance of".
Thanks, closing.