<rule id="Number"> <one-of> <item weight="2"> <!-- Seis is weighted to be twice as likely to be --> <!-- recognized as Tres --> <ruleref uri="Seis" /> </item> <item weight="1"> <!-- Notice that the weight is applied in the item --> <!-- tag in grXML --> <ruleref uri="Tres" /> </item> </one-of> </rule> <rule id="Number"> <one-of> <item>tres</item> <item>tre</item> </one-of> </rule> <rule id="Seis"> <item>seis</item> </rule>