1<element name="card" xmlns="http://relaxng.org/ns/structure/1.0">
2 <element name="name">
3 <text/>
4 </element>
5 <element name="email">
6 <text/>
7 </element>
8 <element name="preferredFormat">
9 <choice>
10 <value>html</value>
11 <value>text</value>
12 </choice>
13 </element>
14</element>
15