Re: [w3c/browser-payment-api] General Comment on Registry Design (#148)

Just for completeness... there are several other "registries" maintained by the W3C:

- RDFa maintains an "initial context" in which CURIE prefixes are registered [1]
- There is a registry of "rel" values maintained for HTML5 [2]
- There is a collection of base "role" values for XHTML and HTML [3]
- There was a naming "model" for XHTML family markup languages and DOCTYPEs that defined a more distributed model for registering document types [4]
- The Role Attribute defines an extension mechanism that uses the web as registry, but requires dereferencable end-points [5]
- JSON-LD defines an arbitrary extension mechanism via dereferencable contexts - again using the web as the registry [6]


I am sure there are more.  That was off the top of my head (and things I have worked on).  


[1] https://www.w3.org/2011/rdfa-context/rdfa-1.1
[2] https://wiki.whatwg.org/wiki/RelExtensions
[3] https://www.w3.org/1999/xhtml/vocab
[4] https://www.w3.org/TR/2008/REC-xhtml-modularization-20081008/conformance.html#s_conform_naming_rules
[5] https://www.w3.org/TR/2013/REC-role-attribute-20130328/#extending-the-collection-of-roles
[6] https://www.w3.org/TR/json-ld/#the-context

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