In general, I agree that this is the right solution. However, I'm concerned about the example given. I don't know what language it's in, but in IPP the syntax tag is applies to an individual attribute value, not a whole attribute. So it should be rewritten as
attr-name='requested-attributes'
value-tag=keyword
attr-value='printer-info'
value-tag=keyword
attr-value='printer-location'
>
>
>
> In Savannah we agreed that in the operations get-job-attributes, get-jobs,
> and get-printer-attributes, if the 'requested-attributes' attribute
> contains values specifying attributes not supported by the printer, the
> printer SHALL return status code
> 'successful-ok-ignored-or-substituted-attributes' and MAY return these
> attributes in the 'unsupported-attributes' group. My question is, if the
> printer chooses to list the attributes as unsupported in the response,
> which of the following formats should it use (suppose the printer doesn't
> support 'printer-info' and 'printer-location'):
>
> attr-tag=value-tag-unsupported
> attr-name='printer-info'
> attr-value=NULL
>
> attr-tag=value-tag-unsupported
> attr-name='printer-location'
> attr-value=NULL
>
> - or -
>
> attr-tag=value-tag-keyword
> attr-name='requested-attributes'
> attr-value='printer-info'
> attr-value='printer-location'
>
>
> -Hugo
>
>
>
>
>
>
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