[webservices] stationxml for responses is invalid

[Philip Crotwell]

Hi

The returned xml from this query is invalid according to the fdsn
stationxml spec. :

service.iris.edu/fdsnws/station/1/query?network=IU&station=ANMO&loc=00&channel=BHZ&level=response&nodata=404

The xschema requires all <Zero> elements to come before all <Pole> elements
in a <PolesZeros> element, but the document has <Pole>s and then <Zero>s.

This is a case where xschema's lack of ability to allow unordered content
makes it hard to use. RelaxNG has a much nicer way of specifying a schema
IMHO, but I guess that stationxml is unlikely to change from xschema.

Philip
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