instantiationLanguage best practices

[rfraimow]

Similarly to the last issue, instantiationLanguage includes a statement under 'controlled vocabularies' that I think really should be included in the schema as a best practice

[dericed]

There's also a weird xml think we language fields are not repeatable but use a semicolon delimited pattern of 3 char language codes. Since it has a regex and this is unusual in xml I think the document needs to be more clear. For instance

This is valid:

<instantiationLanguage>eng;deu</instantiationLanguage>

This is invalid:

<instantiationLanguage>eng</instantiationLanguage>
<instantiationLanguage>deu</instantiationLanguage>

This is invalid:

English

[kvanmalssen]

Per Schema Team: instantiationLanguage will be made repeatable. Multiple language values separated by semi-colon will still be valid.