1<schemalist> 2 <schema id='a'> 3 <key name='foo' type='s'> 4 <default>''</default> 5 </key> 6 </schema> 7 8 <schema id='b' extends='a'> 9 <key name='bar' type='s'> 10 <default>''</default> 11 </key> 12 </schema> 13 14 <schema id='c' extends='a'> 15 <key name='foo' type='s'/> 16 </schema> 17</schemalist> 18