[CITE-Forum] A question about XML validator with substitution groups.

宗岩 Rocky rocky at gis.tw
Thu Nov 29 20:13:08 EST 2012

Hi, all,

        Carsten got an issue when testing SOS 2.0, and It’s seems he is right.

        Carsten’s report:

The XMLValidatingParser throws the following message:

Validation error:
 cvc-complex-type.2.4.a: Invalid content was found starting with element 'sams:SF_SpatialSamplingFeature'. One of '{"http://www.opengis.net/gml/3.2":AbstractFeature}' is expected.
1 validation error detected.

        This looks like a problem of the used XML validator with substitution groups.

Because 'sams:SF_SpatialSamplingFeature' is a substitution of gml:AbstractFeature and thus a valid element.


In SOS 2.0, Table 28:

featureMember's Data type and values => GFI_Feature)

In 10-004r3, Top20 Observations and Measurements, C.1 Introduction:

GFI_Feature is an instance of GF_FeatureType. (ISO19109:2005)

GFI_Feature is implemented in GML (ISO 19136:2007) by gml:AbstractFeature element and gml:AbstractFeatureType type

In http://schemas.opengis.net/gml/3.2.1/feature.xsd:

AbstractFeature's substitutionGroup is gml:AbstractGML

In O&M 2.0 XML, 7.15 Spatial sampling feature data,

sams:SF_SaptialSamplingFeature => (implemented)

(represented through sams:SF_SaptialSamplingFeature)

  (dependency - AbstractGeometry (GML 3.2.1 Clause 10.1.3))

In http://schemas.opengis.net/gml/3.2.1/geometryBasic0d1d.xsd:

AbstractGeometry's substitutionGroup is gml:AbstractGML

李宗岩 (Rocky)
助理工程師 assistant software engineer
逢甲大學地理資訊系統研究中心 GIS Research Center, Feng-Chia University
04-24516669 #350
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