add TYPE property to EXT element

[mamund]

i've found a handful of times that i need to mark EXT elements with TYPE information to help reader/writer tooling. This will be a single string property that can contain any valid string text. the meaning of that value can be documented when documenting the EXT element itself.

<ext id="hatSize" type="enum" value="large medium small really-big" />

this may also help with issue #8

[filip26]

If type value range is not defined by the specification then it adds just a little value, because it is expected that a client/processor 'knows' but if a client knows then it has to know an unspecified type attribute as well.

if the type value range is defined then I'm thinking maybe introducing other elements could be more readable.

e.g.

<enum id="hatSize" value="...."/>

I personally like keeping the spec simple. Let's discuss it.

[mamund]

we can discuss this in the weekly AOOH. I'm OK w/ dropping the TYPE element for EXT if it complicates things.

[mamund]

decided to not add this right now. not a wide need and we can address late, if needed.

[mamund]

closed out