The generic syntax of URI (and of IRI with slightly different definition of the elements) is:
<scheme name> : <hierarchical part> [ ? <query> ] [ # <fragment> ]
I would even go further and say that well-designed URIs for Linked Data should also forgo the query part. A clean URI to be used as identifier in Linked Data should stick to this limited generic syntax:
http: <hierarchical part>
I do not argue to disallow URIs with query part, but I wonder how much they are really used and needed for resources other than Web resources. Especially URIs for non-information resources, should not have a query part. Most web applications will not distinguish between these two:
These are different URIs but equivalent URLs. Choosing URIs that are not equivalent to other URIs in common non-RDF applications is a good advice, isn’t it? If you choose a cleaner URI like
http://example.org/foobar you could use additional query parts to refer to different representations (information resources) and services around the resource that is referenced by the base URI.
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