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