Hi,
I am trying to limit the fields returned by a WFS GetFeature request.
This needs to be an enforced policy. Reading the documentation I found
that a schema document could be prepared and added to the data
directory. I followed the instructions and had some success, a
DescribeFeatureType request did not list the field as present.
Then I ran into problems. If I request the data as 'gml3' then the field
is not present, however request 'csv', 'json' or 'shape-zip' and the
field is present.
Is this a know bug and if so is there a workaround? Better still, is
there an easier way of achieving the desired result :-)
Below are instructions for reproducing on a base install of GeoServer
(version 2.0.3 stable) running on Tomcat 6.0.26 with Java JDK 1.6.0_20.
I tried on the latest RC (2.1-RC4) using own data, have not replicated
with this test case but can if necessary. I stripped point data out and
limited this to one feature for sake of brevity, replaced with the text
**snip**. You will see that the attribute CFCC was hidden, not present
in the GML download, but still present in the JSON and CSV downloads.
Issue a DescribeFeatureType request to determine available attributes:
======================================================================
http://localhost:8080/geoserver/wfs?service=wfs&version=1.1.0&request=De
scribeFeatureType&typeName=tiger:poly%5Flandmarks
<?xml version="1.0" encoding="UTF-8"?>
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema";
xmlns:cite="http://www.opengeospatial.net/cite";
xmlns:gml="http://www.opengis.net/gml";
xmlns:it.geosolutions="http://www.geo-solutions.it";
xmlns:nurc="http://www.nurc.nato.int";
xmlns:sde="http://geoserver.sf.net";
xmlns:sf="http://www.openplans.org/spearfish";
xmlns:tiger="http://www.census.gov";
xmlns:topp="http://www.openplans.org/topp";
elementFormDefault="qualified" targetNamespace="http://www.census.gov";>
<xsd:import namespace="http://www.opengis.net/gml";
schemaLocation="http://localhost:8080/geoserver/schemas/gml/3.1.1/base/g
ml.xsd"/>
<xsd:complexType name="poly_landmarksType">
<xsd:complexContent>
<xsd:extension base="gml:AbstractFeatureType">
<xsd:sequence>
<xsd:element maxOccurs="1" minOccurs="0" name="the_geom"
nillable="true" type="gml:MultiSurfacePropertyType"/>
<xsd:element maxOccurs="1" minOccurs="0" name="LAND"
nillable="true" type="xsd:double"/>
<xsd:element maxOccurs="1" minOccurs="0" name="CFCC"
nillable="true" type="xsd:string"/>
<xsd:element maxOccurs="1" minOccurs="0" name="LANAME"
nillable="true" type="xsd:string"/>
</xsd:sequence>
</xsd:extension>
</xsd:complexContent>
</xsd:complexType>
<xsd:element name="poly_landmarks" substitutionGroup="gml:_Feature"
type="tiger:poly_landmarksType"/>
</xsd:schema>
Change the schema as shown below (comment out one field):
=========================================================
<?xml version="1.0" encoding="UTF-8"?>
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema";
xmlns:cite="http://www.opengeospatial.net/cite";
xmlns:gml="http://www.opengis.net/gml";
xmlns:it.geosolutions="http://www.geo-solutions.it";
xmlns:nurc="http://www.nurc.nato.int";
xmlns:sde="http://geoserver.sf.net";
xmlns:sf="http://www.openplans.org/spearfish";
xmlns:tiger="http://www.census.gov";
xmlns:topp="http://www.openplans.org/topp";
elementFormDefault="qualified" targetNamespace="http://www.census.gov";>
<xsd:import namespace="http://www.opengis.net/gml";
schemaLocation="http://localhost:8080/geoserver/schemas/gml/3.1.1/base/g
ml.xsd"/>
<xsd:complexType name="poly_landmarksType">
<xsd:complexContent>
<xsd:extension base="gml:AbstractFeatureType">
<xsd:sequence>
<xsd:element maxOccurs="1" minOccurs="0" name="the_geom"
nillable="true" type="gml:MultiSurfacePropertyType"/>
<xsd:element maxOccurs="1" minOccurs="0" name="LAND"
nillable="true" type="xsd:double"/>
<!--
<xsd:element maxOccurs="1" minOccurs="0" name="CFCC"
nillable="true" type="xsd:string"/>
-->
<xsd:element maxOccurs="1" minOccurs="0" name="LANAME"
nillable="true" type="xsd:string"/>
</xsd:sequence>
</xsd:extension>
</xsd:complexContent>
</xsd:complexType>
<xsd:element name="poly_landmarks" substitutionGroup="gml:_Feature"
type="tiger:poly_landmarksType"/>
</xsd:schema>
Save schema in required directory:
==================================
C:\apache-tomcat-6.0.26\webapps\geoserver\data\workspaces\tiger\nyc\poly
_landmarks\schema.xsd
Restart Tomcat
==============
Issue a DescribeFeatureType request to verify attribute hidden:
===============================================================
http://localhost:8080/geoserver/wfs?service=wfs&version=1.1.0&request=De
scribeFeatureType&typeName=tiger:poly%5Flandmarks
<?xml version="1.0" encoding="UTF-8"?>
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema";
xmlns:cite="http://www.opengeospatial.net/cite";
xmlns:gml="http://www.opengis.net/gml";
xmlns:it.geosolutions="http://www.geo-solutions.it";
xmlns:nurc="http://www.nurc.nato.int";
xmlns:sde="http://geoserver.sf.net";
xmlns:sf="http://www.openplans.org/spearfish";
xmlns:tiger="http://www.census.gov";
xmlns:topp="http://www.openplans.org/topp";
elementFormDefault="qualified" targetNamespace="http://www.census.gov";>
<xsd:import namespace="http://www.opengis.net/gml";
schemaLocation="http://localhost:8080/geoserver/schemas/gml/3.1.1/base/g
ml.xsd"/>
<xsd:complexType name="poly_landmarksType">
<xsd:complexContent>
<xsd:extension base="gml:AbstractFeatureType">
<xsd:sequence>
<xsd:element maxOccurs="1" minOccurs="0" name="the_geom"
nillable="true" type="gml:MultiSurfacePropertyType"/>
<xsd:element maxOccurs="1" minOccurs="0" name="LAND"
nillable="true" type="xsd:double"/>
<xsd:element maxOccurs="1" minOccurs="0" name="LANAME"
nillable="true" type="xsd:string"/>
</xsd:sequence>
</xsd:extension>
</xsd:complexContent>
</xsd:complexType>
<xsd:element name="poly_landmarks" substitutionGroup="gml:_Feature"
type="tiger:poly_landmarksType"/>
</xsd:schema>
Request features as GML
=======================
http://localhost:8080/geoserver/wfs?&service=wfs&version=1.1.0&request=G
etFeature&typeName=tiger:poly_landmarks&outputFormat=gml3&maxFeatures=1
<?xml version="1.0" encoding="UTF-8"?>
<wfs:FeatureCollection numberOfFeatures="2"
timeStamp="2011-04-20T15:55:11.412+01:00"
xsi:schemaLocation="http://www.census.gov
http://localhost:8080/geoserver/wfs?service=WFS&version=1.1.0&re
quest=DescribeFeatureType&typeName=tiger%3Apoly_landmarks
http://www.opengis.net/wfs
http://localhost:8080/geoserver/schemas/wfs/1.1.0/wfs.xsd";
xmlns:ogc="http://www.opengis.net/ogc";
xmlns:tiger="http://www.census.gov";
xmlns:cite="http://www.opengeospatial.net/cite";
xmlns:nurc="http://www.nurc.nato.int";
xmlns:sde="http://geoserver.sf.net";
xmlns:wfs="http://www.opengis.net/wfs";
xmlns:topp="http://www.openplans.org/topp";
xmlns:it.geosolutions="http://www.geo-solutions.it";
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
xmlns:sf="http://www.openplans.org/spearfish";
xmlns:ows="http://www.opengis.net/ows";
xmlns:gml="http://www.opengis.net/gml";
xmlns:xlink="http://www.w3.org/1999/xlink";>
<gml:featureMembers>
<tiger:poly_landmarks gml:id="poly_landmarks.1">
<tiger:the_geom>
<gml:MultiSurface srsDimension="2"
srsName="urn:x-ogc:def:crs:EPSG:4326">
<gml:surfaceMember>
<gml:Polygon>
<gml:exterior>
<gml:LinearRing>
<gml:posList>**snip**</gml:posList>
</gml:LinearRing>
</gml:exterior>
</gml:Polygon>
</gml:surfaceMember>
</gml:MultiSurface>
</tiger:the_geom>
<tiger:LAND>2.0</tiger:LAND>
<tiger:LANAME>Washington Square Park</tiger:LANAME>
</tiger:poly_landmarks>
</gml:featureMembers>
</wfs:FeatureCollection>
Request feature as JSON:
========================
http://localhost:8080/geoserver/wfs?&service=wfs&version=1.1.0&request=G
etFeature&typeName=tiger:poly_landmarks&outputFormat=json&maxFeatures=1
{
"type":"FeatureCollection",
"features":[
{
"type":"Feature",
"id":"poly_landmarks.1",
"geometry":{
"type":"MultiPolygon",
"coordinates":[
[
[
**snip**
]
]
]
},
"geometry_name":"the_geom",
"properties":{
"LAND":2,
"CFCC":"D85",
"LANAME":"Washington Square Park"
}
}
],
"crs":{
"type":"EPSG",
"properties":{
"code":"4326"
}
},
"bbox":[
40.72999,
-73.99955899999999,
40.738821,
-73.985192
]
}
Request feature as CSV:
=======================
http://localhost:8080/geoserver/wfs?&service=wfs&version=1.1.0&request=G
etFeature&typeName=tiger:poly_landmarks&outputFormat=csv&maxFeatures=1
FID,the_geom,LAND,CFCC,LANAME
poly_landmarks.1,"MULTIPOLYGON ((**snip**))",2,D85,Washington Square
Park
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