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       var metersPerUnit = 111319.4908;  //value returned from mapguide
        var inPerUnit = OpenLayers.INCHES_PER_UNIT.m * metersPerUnit;
        OpenLayers.INCHES_PER_UNIT["dd"] = inPerUnit;
        OpenLayers.INCHES_PER_UNIT["degrees"] = inPerUnit;
        OpenLayers.DOTS_PER_INCH = 96;

it seems both OpenLayers.INCHES_PER_UNIT and OpenLayers.DOTS_PER_INCH are
global settings.

I doubt if two different layers, such as WMS and MapGuide are added to
Openlayers Map, the above settings will influence both layers. but it seems
the settings shouldn't be changed for WMS?

??
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