return more than one element with XQuery: output repetition

Question

I have a xsd file. For every xs:element inside xs:sequence, I want to convert them to <Class></Class>. So for this file below, the output should contain 3 times of <Class></Class>.

<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
  <xs:element name="contacts">
    <xs:complexType>
      <xs:sequence>
        <xs:element ref="contact"/>
      </xs:sequence>
    </xs:complexType>
  </xs:element>

  <xs:element name="contact">
    <xs:complexType>
      <xs:sequence>
        <xs:element name="firstname" type="xs:NCName"/>
        <xs:element name="lastname" type="xs:NCName"/>
      </xs:sequence>
      <xs:attribute name="citizen" type="xs:string"/>
    </xs:complexType>
  </xs:element>
</xs:schema>

But instead I got this:

$ zorba -i -f -q test.xqy
<?xml version="1.0" encoding="UTF-8"?>
<Class/>
<Class/>

This output looks so strange. I dont have <Class/> in the xqy file.

xqy file:

for $x in doc("test.xsd")/xs:schema/xs:element/xs:complexType/xs:sequence
return <Class>
  </Class>

Answer 1

You could improve the XPath part with /* because you are searching for children of the xs:sequence:

XQuery 3.0

for $x in doc("test.xsd")/xs:schema/xs:element/xs:complexType/xs:sequence/*
return <Class></Class>

With this I have:

<?xml version="1.0" encoding="UTF-8"?>
<Class/>
<Class/>
<Class/>

Answer 2

In XML, <Class></Class> and <Class/> are equivalent nodes with mere serialization differences. Your XQuery processor is removing the whitespace between <Class> and </Class>. You could try setting serialization options for the processor, or added <Class xml:space="preserve">.