Is 'currencySystem' required?

[rsolomakhin]

The spec says:

The following fields are required:
currencySystem...

However, the WebIDL for currencySystem does not have the required keyword. Let's change the phrasing of the spec to make it clear that currencySystem is optional. The developer could, for example, not specify it, or specify currencySystem: null or currencySystem: undefined, correct?

[tommythorsen]

I vote for just erasing the string The following fields are required: from Section 5 of the specification. While we're at it, I would erase such strings from Section 10 and Section 12 as well.

[ianbjacobs]

As long as the WebIDL is normative, that seems fine. The section on conformance seems to confirm this:
"As well as sections marked as non-normative, all authoring guidelines, diagrams, examples, and notes in this specification are non-normative. Everything else in this specification is normative. "

Ian

[romandev]

It might be correct. Because it's not nullable and it has default value. So, the value is always set as something. So, we can say the value is always required. (But we can change the string clearer.)

Also, according to IDL spec[1], the currency system (non-nullable DOMString) will be resolved as follows:
currencySystem: null -> "null"
currencySystem: undefined -> "urn:iso:std:iso:4217" (default value)

[1] https://heycam.github.io/webidl/#idl-DOMString

[marcoscaceres]

I agree with @tommythorsen - we should not replicate what is in the IDL.