Subject: Stateless Catalog Use Cases
Resent-Date: Fri, 20 Apr 2001 13:23:16 -0500 (EST)
Resent-From: servicemodel@opengis.org
Date: Fri, 20 Apr 2001 16:04:28 -0230
From: "Larry Bouzane" <larry@compusult.nf.ca>
Organization: Compusult Limited
To: "Service Model" <servicemodel@opengis.org>, <catalog.wg@opengis.org>

Compusult Limited currently uses the Stateless catalog in its Map Manager
Web Mapping Client as follows:

1) User is presented with a search page that includes fields for searching
TITLE, ABSTRACT, and KEYWORD. GEOGRAPHIC region, SRS and FORMAT parameters
are also added to the search to ensure that only results over the area of
interest in a compatible SRS and available in a browser-friendly format
(gif, jpg, png) are returned.

2) The client composes an OGC Common query from the search parameters and
passes it to the Stateless catalog.  The client asks for the summary result
set for the results of the search.

3) Identification components of the summary results are displayed to the
user in tabular format with a check box for overlaying the layer in the
current map view.

4) When a layer is selected for display, the operation section of the
Summary result set is used to compose the WMS call to overlay the map to the
user.

5) When additional information is requested about a layer, a request for the
Full present of the layer service is sent to the catalog and the result is
shown to the user.

We are proposing to modify the Summary result set to make it much smaller
than it is currently but to include significantly more information than the
brief result set. This will result in the following use case:

1) User is presented with a search page that includes fields for searching
TITLE, ABSTRACT, and KEYWORD. GEOGRAPHIC region, SRS and FORMAT parameters
are also added to the search to ensure that only results over the area of
interest in a compatible SRS and available in a browser-friendly format
(gif, jpg, png) are returned.

2) The client composes an OGC Common query from the search parameters and
passes it to the Stateless catalog.  The client asks for a new Summary
result set for the results of the search.  The new summary result set will
not contain any operation parameter information but will contain enough
identification data to ensure that the user can make a reasonable judgment
on which layer service they wish to invoke.  This includes things such as
the geographic footprint, titles, keywords, points of contact etc...

3) Identification components of the summary results are displayed to the
user in tabular format with a check box for overlaying the layer in the
current map view.

4) When a layer is selected for display, the catalog is consulted for the
Full present of the layer service in question and this is used to compose
the WMS call to overlay the map.

5) When additional information is requested about a layer, a request for the
Full present of the layer service is sent to the catalog and the result is
shown to the user.

Regards,

Larry