Table 55 — KVP encoding for constraints
Keyword
b
Description Data type and value
Optionality
CONSTRAINT_LANGUAGE Identifies the
predicate language used for
the value of the Constraint
Code List with allowed values:
CQL_TEXT, used to
indicate CQL. FILTER,
used to indicate OGC Filter.
Zero or one Optional
a
Must be specified with the Constraint
CONSTRAINT_LANGUAGE_VERSION Identifies the
version of the predicate
language used. Character String
Zero or one There is no default as
the parameter is specified if required to
indicate which version of a specification the
value of the constraint parameter conforms to.
Constraint Text of query
constraint in the predicate
language identified by the
CONSTRAINT
_ LANGUAGE
Character String Zero or one Optional
Must be specified with the
CONSTRAINT _LANG
UAGE
a The CONSTRAINT_LANGUAGE parameter contains the same information as the contents of the Constraint element in XML encoding.
b Parameter keywords, for KVP encoding, are case insensitive.
The following XML schema fragments define how the predicate language may be XML encoded in CSW operations that allow constraints to be defined Query, Update and
Delete:
xsd:complexType name=QueryConstraintType id=QueryConstraintType xsd:choice
xsd:element ref=ogc:Filter xsd:element name=CqlText type=xsd:string
xsd:choice xsd:attribute name=version type=xsd:string use=required
xsd:attribute xsd:complexType
The version parameter may be used to specify a version number indicating which version of a specification the constraint conforms to. For example, in the XML encoding, if the
ogc:Filter element is being used, the version parameter could be set to “1.1.0”
indicating that the filter conforms to version 1.1.0 of the Filter Encoding Implementation Specification
[OGC 04-095].
10.3.5 General model message mapping
Table 56 maps the general model operations, defined in Clause 7, to the Catalogue Service for the Web CSW operations. This table does not list the general model
operations that are not mapped to CSW operations.
Copyright © 2007 Open Geospatial Consortium, Inc. All Rights Reserved.
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Table 56 — General model to CSW mapping
General Model Operation CSW Operation
OGC_Service.getCapabilities OGC_Service.GetCapabilities Discovery.query CSW-Discovery.GetRecords
Discovery.present CSW-Discovery.GetRecordById Discovery.describeRecordType
CSW-Discovery.DescribeRecord Discovery.getDomain CSW-Discovery.GetDomain
Manager.transaction CSW-Publication.Transaction Manager.hervestRecords CSW-Publication.Harvest
10.3.6 Common request parameters
All CSW operation requests except for GetCapabilities shall include the three parameters specified in Table 20 of [05-008c1]. Only one of these parameters is included in the
general catalogue model, the others are specific to the HTTP protocol binding.
In KVP encoding, these common parameters in CSW operation requests are encoded as shown in Table 57. Note that the parameter names in all KVP encodings shall be handled
in a case insensitive manner while parameter values shall be handled in a case sensitive manner.
Table 57 — KVP encoding of common operation request parameters
Keyword Datatype and value
Optionality Parameter in general model
REQUEST Character String type
Value is operation name e.g., “DescribeRecord”
One Mandatory none
service Character String type
Fixed values of “CSW” One Mandatory
serviceId version
Character String type Fixed value of “2.0.2”
One Mandatory none
In XML encoding, all operation request elements, except for GetCapabilities, are extended from the following XML Schema fragment:
xsd:complexType name=RequestBaseType xsd:attribute name=service type=xsd:string
use=required fixed=CSW xsd:attribute name=version type=ows:ServiceType
use=required fixed=2.0.2 xsd:complexType
The “service” parameter is used to indicate that the request is a CSW request. This parameter shall be specified for all CSW requests. The “version” parameter is used to
indicate that the associated CSW request conforms to this specification. This is indicated by setting the value of the version parameter to 2.0.2. This XML Schema fragment does
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not include a “request” attribute, since the name of the operation requested is always the name of the XML element encoding the request.
10.3.7 Exception reporting
