Thank you for your answer! But this solution does not work with one-to-many relationships. When I run the following script: let $i := <root>
<a id = "a1" idref = "b1"> aaa1</a> <a id = "a2" idef = "b1">aaa2</a> <a id = "a3" idef= "b2"> aaa3</a> <a id = "a11" idref = "b2"> aaa11</a> <b id = "b1" idref = "a1 a2">bb1</b> <b id = "b2" idref = "a3 a11">bb2</b> </root> return $i/*[matches(@idref, 'a1')] BaseX produces the result:
<b id="b1" idref="a1 a2">bb1</b> <b id="b2" idref="a3 a11">bb2</b> that is different from: <b id="b1" idref="a1 a2">bb1</b> Besides, my question is about the function idref()? Is it supported? I find some examples here: http://www.xqueryfunctions.com/xq/fn_idref.html I have defined DTD, schema, but the result is the same. BaseX requires the name of the attribute-identifier to contain “id” and the name of the attribute with references to contain ‘idref’. But the function idref() returns result only if the relationship is one-to-one. I would be grateful if you tell me how to apply the function idref() when the relationship is one-to-many. Best regards, Tsvetanka