URI (and namespace) equality

[jakebeal]

I ran into problems with namespace URIs in #SynBioDex/pySBOL3/issues/343 , because I was comparing them with string equality rather than URI equality.

To help keep other people from running into this problem, I would propose adding the following clarifying text to the specification in Section 5.1:

Because identities are URIs, both URIs and URI prefixes MUST be compared under the rules for URI equality. This means, for example, that namespaces https://synbiohub.org/, https://synbiohub.org, and https://synbiohub.org:443/ are all equal.

[jakebeal]

Closed by #481

[cjmyers]

This is not true, need to revert the change to the spec

[goksel]

Java treats the following URLs differently, and the prints false both comparisons.
URI a=URI.create("http://abc.org");
URI b=URI.create("http://abc.org/");
URI c=URI.create("http://abc.org:443");

 System.out.print(a.equals(b));
 System.out.print(a.equals(c));

[cjmyers]

Namespace should not end with a delimiter.