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[WFS 2.0] Allow client to control which features in a join query are presented in a response

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Change Request

#:

287

Assigned OGC

Document #:

13-035

Name:

*

Panagiotis (Peter) A. Vretanos

Organization:

*

CubeWerx Inc.

Email:

*

pvretano@cubewerx.com

Document

Name/Version:

*

Web Feature Service 2.0 Interface Standard (also ISO 19142) / 2.0

OGC Project

Document:

*

09-025r1

If this is a revision of a previous submission and you have a Change Request Number, then check here:

Enter the CR number here:

Enter the Revsion Number that you are revising here:

Title:

*

[WFS 2.0] Allow client to control which features in a join query are presented in

Source:

*

dandrosevic@galdosinc.com

Work item code:

Category:

*

$#'##$!

Reason for

change:

*

At the moment a join query always returns tuples of feature types satisfying the join predicate. The problem with this is that in many cases the client only wants one (or a subset) of the feature types being queried. For example, the query "Find all roads that cross Algonquin Park" is a join query but the client only really wants the roads.

Summary of

change:

*

I would like to suggest adding an optional element as a query

projection clause. That element would specify which features will be included in the response to a query in case of a join query. We briefly discussed it during our last telecom. Currently all features are returned and it requires a client application to filter the response. That response can be quite big. Here is one option: <xsd:element name="ResultTypeName"

type="fes:ResultTypeNameType"

substitutionGroup="fes:AbstractProjectionClause"/> <xsd:simpleType name="ResultTypeNameType">

<xsd:union memberTypes="xsd:NCName xsd:QName"/> </xsd:simpleType>

(2)

aliases.

Example 1 (no aliases):

<Query typeNames="myns:Building myns:Road myns:River">

<ResultTypeName>myns:Road</ResultTypeName> <PropertyName>myns:numberOfLanes</PropertyName> <fes:Filter>

....

</fes:Filter> </Query>

This query would return only myns:Road.

Example 2 (with aliases):

<Query typeNames="myns:Building myns:Road myns:River" aliases="a b c">

<ResultTypeName>b</ResultTypeName> <ResultTypeName>c</ResultTypeName>

<PropertyName>b/myns:numberOfLanes</PropertyName> <fes:Filter>

....

</fes:Filter> </Query>

This query would return only myns:Road and myns:River.

Consequences if

not approved:

1) Clients have to filter the response on the client side to get what they want. 2) Server may transmit more information that required to satisfy the query.

Clauses affected:

*

Clause 11

Additional

Documents

affected:

Supporting

Documentation:

Comments:

Status:

Assigned

Assigned To:

WFS/FES SWG

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