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While loading a layer from an ArcIMS Web Feature Service (WFS) using the WFS Connector for ArcIMS, the following error message is returned:
"Unable to read GML file"
The layer ID in the WFS service’s AXL file is a numeric value, for example: 0, 1, 2.
Change the layer ID in the AXL file to a non-numeric value and refresh the map service. The layer now loads into ArcMap.