I have an existing web service that I'm trying to call using dojo.rpc services. I've tried dojox.rpc.Service, dojo.rpc.RpcService and dojo.rpc.JsonService. I get the farthest using dojo.rpc.JsonService.

Here's my code using dojo.rpc.JsonService.

// BEGIN CODE SNIPPET
// SeamlessDownload.smd
{
"serviceType": "JSON-RPC",
"serviceURL": "http://imsdemo.cr.usgs.gov/distDownloadRequest/services/DistDownloadRequestService",
"methods":[
{
"name": "oneStepDownload",
"parameters":[