Open Geospatial Consortium
OGC Doc 08-185r1
CR-Form-v3
CHANGE REQUEST
GML CR 08-185r1
rev-
Current version: 3.2.1 For
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Proposed change affects: AS Imp Spec X Best Practices Paper Other
Title: Clarify GML encoding rule for codeList classes tagged asDictionary="true"
Source: CSIRO, JRC
Work item code: Date: 2009-08-06
Category: B
Use one of the following categories:
F (Critical correction)
A (corresponds to a correction in an earlier release)
B (Addition of feature),
C (Functional modification of feature)
D (Editorial modification)
Detailed explanations of the above categories can be found in the TC Policies and Procedures.
Reason for change: 1. The encoding rule for classes stereotyped «codeList» and tagged
asDictionary="true" requires information that is not provided in the model
2. The encoding rule for feature properties whose type is a class stereotyped «codeList» is ambiguous/incomplete.
Summary of change: 1. Table E.2: add tagged values
- dictionaryCodeSpace (only «codeList») - dictionaryIdentifier (only «codeList») - itemCodeSpace (only «codeList») 2. Sub-clause E.2.4.9 replace the sentence
Alternatively, if the class carries a tagged value "asDictionary" with the value "true", a gml:Dictionary shall be used to represent a code list.
with
Alternatively, if the class carries a tagged value "asDictionary" with the value "true", the tagged value "dictionaryCodeSpace" may provide a URI that identifies the authority responsible for the codeList, "itemCodeSpace" may provide a URI that identifies the authority responsible for the items, the tagged value "dictionaryIdentifier" may provide a URI that identifies the codeList, and a gml:Dictionary shall be used to represent a code list.
Then the example dictionary should be accompanied by a note indicating the value for the tagged value that would lead to this dictionary representation, i.e.
The OGC Technical Committee Policies & Procedures 05-020r3
dictionaryIdentifier=”ParcelUsage”
itemCodeSpace=”http://www.someorg.de/cl.xml#ParcelUsage”
NOTE: in general there is no fixed relationship between the codeSpace for the dictionary and item identifiers.
3. Sub-clause E.2.4.11 EXAMPLE 6 should be replaced as follows:
EXAMPLE 6 The code list "BuildingType" shall be represented as:
<element name="type" type="ex:BuildingTypeType"/> if asDictionary="false" or <element name="type" type="gml:CodeType"> <annotation> <appinfo>
<gml:defaultCodeSpace>http://www.someorg.de/example/cl.xml</gml:defaultCodeSpace> </appinfo> </annotation> </element>
If asDictionary="true", where the value of the defaultCodeSpace is provided by the itemCodeSpace tagged value on the target class.
Consequences if
not approved: Inconsistent encoding of dictionaries.
Clauses affected: E
Other specs Other core specifications
Affected: Abstract specifications Best Practices Document
Supporting Doc.
Other comments: This revision of the CR removes the ‘memberIdentifierStem’ tagged value and rules. The original proposal used assumptions about the structure of identifiers for dictionary entries that are not resolved, so this aspect has been deferred.
Status
Disposition
