PS> Question about DocumentTypeSupportQuery

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In the ServiceCapabilities interface, the DocumentTypeSupportQuery has two
parameters

documentType:String
targetDeviceIdentifier:String

The targetDeviceIdentifier may be null or empty if the client only wishes
to test whether the print service supports a particular documentType. What
exactly does this mean? (What is the utility?) I'm thinking that a print
service will support conversions "from and to" and it may be meaningless
to ask the print service if it supports one side of the transform.
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Harry Lewis
IBM Printing Systems
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