1<element name="example" xmlns="http://relaxng.org/ns/structure/1.0">
2  <zeroOrMore>
3    <attribute>
4      <anyName>
5        <except>
6          <name>xml:space</name>
7        </except>
8      </anyName>
9    </attribute>
10  </zeroOrMore>
11  <optional>
12    <attribute name="xml:space">
13      <choice>
14        <value>default</value>
15        <value>preserve</value>
16      </choice>
17    </attribute>
18  </optional>
19</element>
20