Agustin,
Thanks for the suggestion.
Given that several of the stock DSpace types include a comma, I'm wondering if a "<type-bind-separator>" element should be added that can be used to specify a different multi-value separator (such as a colon instead of a comma). I can create an issue and submit a pull request, if this is something that would be acceptable.
// parsing of the <type-bind> element (using the colon as split separator)
but I do not see any evidence that anything other than a comma was ever used (at least back to DSpace 3.0).
Thanks,
David