[postgis-users] spatial reference system questions

[Steffen Koehler]

Hello,

I have installed postgis 0.8, proj 4.4.7 and mapserver 4.0
And I have data from germany with the following esri-prj description
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PROJCS["Germany_Zone_3",GEOGCS["GCS_Deutsche_Hauptdreiecksnetz",DATUM["D_Deutsche_Hauptdreiecksnetz",SPHEROID["Bessel_1841",6377397.155,299.1528128]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]],PROJECTION["Transverse_Mercator"],PARAMETER["False_Easting",3500000.0],PARAMETER["False_Northing",0.0],PARAMETER["Central_Meridian",9.0],PARAMETER["Scale_Factor",1.0],PARAMETER["Latitude_Of_Origin",0.0],UNIT["Meter",1.0]]
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I found this in the postgis spatial_ref_sys table as EPSG:31493. But in the 
proj-files there is no EPSG:31493, I must use the ESRI:31493 entry to show 
this data correct with mapserver.
Where is the mistake? Is the spatial_ref_sys-table false or the proj-files.

Can UMN-Mapserver use the entry from spatial_ref_sys for displaying data. 
If this not so, how can I create dynamic maps with different layers from 
postgis with the correct projection.

Thank
Steffen