[mapserver-users] SOS response XML validity

[Kralidis,Tom [Ontario]]

> I have created a mapfile to generate a SOS response 
> containing data from a database. I have understood that 
> mapserver supports only "flat" reporting of the database 
> columns to the xml response.
> 
> My problem is that I wonder whether this kind of "flat" 
> response is valid or not. If I try to validate the response 
> against the xml schema I get errors. 
> 
> How can I solve this problem of xml validity against the schema?
> 
> Here are the errors:
> 
> *** Error start ***
> Element <observedProperty> is not allowed under element 
> <om:Observation>.
>     Reason: The following elements are expected at this 
> location (see below)
>         <om:observedProperty>
>         <om:resultQuality>
>     Annotations of type 'om:ObservationType' (see below)
>         Base type for Observations.
> Observation is an act ("event"), whose result is an estimate 
> of the value of a property of the feature of interest.
> The observed property may be any property associated with the 
> type of the feature of interest.
> The following properties are inherited from AbstractFeatureType:
>     Error location: om:ObservationCollection / om:member / 
> om:Observation / observedProperty
>     Details
>         cvc-model-group: Element <observedProperty> 
> unexpected by type 'om:ObservationType' of element <om:Observation>.
>         cvc-elt.5.2.1: The element <om:Observation> is not 
> valid with respect to the actual type definition 'om:ObservationType'.
> *** Error end ***
>         
> after modifying observedProperty ==> om:observedProperty I get another
> error:
>         
> *** Error start ***
> Text 'temperature' is not allowed for element 
> <om:observedProperty>. The element declaration's content type 
> is 'element-only'.
>     Error location: om:ObservationCollection / om:member / 
> om:Observation / om:observedProperty
>     Details
>         cvc-complex-type.2.3: Text 'temperature' is not 
> allowed for element <om:observedProperty>. The element 
> declaration's content type is 'element-only'.
>         cvc-elt.5.2.1: The element <om:observedProperty> is 
> not valid with
> respect to the actual type definition 
> 'swe:PhenomenonPropertyType'.        
> *** Error end ***
> 
> Here is an example response that I get from my server:
> 
> <?xml version="1.0" encoding="ISO-8859-1"?> 
> <om:ObservationCollection xmlns:gml="http://www.opengis.net/gml"
> xmlns:ows="http://www.opengis.net/ows/1.1"
> xmlns:swe="http://www.opengis.net/swe/1.0.1"
> xmlns:xlink="http://www.w3.org/1999/xlink"
> xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
> xmlns:sos="http://www.opengis.net/sos/1.0"
> xmlns:om="http://www.opengis.net/om/1.0" gml:id="htb_offering"
> xsi:schemaLocation="http://www.opengis.net/om/1.0
> http://schemas.opengis.net/om/1.0.0/om.xsd">
>   <gml:description xmlns:gml="http://www.opengis.net/gml">htb
> data</gml:description>
>   <gml:name xmlns:gml="http://www.opengis.net/gml">Helsinki 
> test bed data</gml:name>
>   <om:member>
>     <om:Observation>
>       <om:samplingTime>
>         <gml:TimeInstant>
>           <gml:timePosition>20081127042000</gml:timePosition>
>         </gml:TimeInstant>
>       </om:samplingTime>
>       <om:procedure xlink:href="urn:ogc:def:procedure:temperature"/>
>       <om:observedProperty>temperature</om:observedProperty>
>       <om:result>
>         <gml:featureMember xmlns:gml="http://www.opengis.net/gml">
>           <gml:temperature>
>             <gml:boundedBy>
>               <gml:Envelope>
>                 <gml:lowerCorner>25.399600 60.316000</gml:lowerCorner>
>                 <gml:upperCorner>25.399600 60.316000</gml:upperCorner>
>               </gml:Envelope>
>             </gml:boundedBy>
>             <msGeometry>
>               <gml:Point>
>                 <gml:pos>25.399600 60.316000</gml:pos>
>               </gml:Point>
>             </msGeometry>
>             <locationid>37</locationid>
>             <insertionTime>20081127042054</insertionTime>
>             <latitude>60.316</latitude>
>             <longitude>25.3996</longitude>
>             <leveltype>altitude</leveltype>
>             <levelvalue>17</levelvalue>
>             <levelunit>m</levelunit>
>             <version>1</version>
>             <parameterName>temperature</parameterName>
>             <value>-1.1</value>
>             <unit>C</unit>
>             <aggregationName>instant</aggregationName>
>             <aggregationValue>0</aggregationValue>
>             <aggregationUnit>n/a</aggregationUnit>
>             <form>n/a</form>
>           </gml:temperature>
>         </gml:featureMember>
>       </om:result>
>     </om:Observation>
>   </om:member>
> </om:ObservationCollection>
> 

Note that we're working on validating the SOS GetObservation output (see
http://trac.osgeo.org/mapserver/ticket/2646), and what is in svn trunk
is very close to a valid XML document.  We're close to having this for
5.4.

..Tom