Setting parts of URI?

[lacanoid]

An interesting and useful thing to do with URIs is setting various parts of the URI, without changing other parts, say changing only the host ot the or query string. This functionality is provided by Perl's URI package, for example.

Also, converters from/to query string part to various key/value types like rowtypes and json can be quite handy. Now one has to assemble and take these apart somewhat manually.
Perhaps something akin to row_to_json, but for building URL query strings.

[petere]

I can see that as being useful. Contributions are welcome.