1<element name="point" xmlns="http://relaxng.org/ns/structure/1.0"
2         datatypeLibrary="http://www.w3.org/2001/XMLSchema-datatypes">
3  <element name="x">
4    <data type="double"/>
5  </element>
6  <element name="y">
7    <data type="double"/>
8  </element>
9</element>
10