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