[jboss-user] [JBossWS] - Illegal XPath expression?

[SunSpider]

when suppling XPath expressions to subscription filter, following 
org.jboss.test.ws.jaxws.wseventing.EventingSupport sample code, some legal expressions are not allowed? I don't understand.

FilterType filter = new FilterType();
	      filter.setDialect(EventingConstants.getDialectXPath().toString());
	      filter.getContent().add("/ns3:ticketsOperationResponse/ns2:ticketsOut/totalPrice>0");
	      filter.getContent().add("string-length(/ns3:orderOperationResponse/ns2:orderOut/clientID)>0");
	      return filter;

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