How does the mapserver work intern with ogr

[Christian Wilmes]

Hi All,

as I haver written in my last post I would like to set up a WFS-Server. For
that I'm using "Virtual Spatial Data" because my Data is in a
PostgreSQL-Database without PostGIS (only Point-Data). So I've written an
OGR-File and using Connection OGR in the Mapscript. For testing I'm using
simple a web-browser.

Know I would like to know everything what does happen when I start a
getFeature-Request (with a BBox) in the browser:
- I think first the mapserver gets the request and send it to the ogr. Is
that right?
- Does the OGR create new Points or a new table or something else?
- What kind of data sends the ogr back to the mapserver?
- At what time will the MBR (Minimum Bounding Box) be calculated. The MBR is
on the top of the GML-Document I get as result.
- Who is calculating the MBR, the mapserver himself or the ogr?
- Where is the data from for calculating the MBR, directly from the
PostgreSQL-Database?

So, as you can see I'm intresting in everything what happens when I'm
sending a getFeature-Request. So I would be very thanksful for any answer.

Best Regards
Christian

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