1<element name="number" xmlns="http://relaxng.org/ns/structure/1.0"> 2 <attribute name="val"> 3 <list> 4 <oneOrMore> 5 <choice> 6 <value>1</value> 7 <value>2</value> 8 <value>3</value> 9 </choice> 10 </oneOrMore> 11 </list> 12 </attribute> 13 <text/> 14</element> 15