maintenance contacts/contractors must contains at least one

[valeriocomo]

maintenance section is defined as stated at the following link.

As defined by the standard, a publiccode.yml is compliant even if a list of contacts or a list of contractors is defined but empty.

It sounds weird and I started to search for old discussion about maintenance section.
I found out this issue (#30).

I suggest to declare explicitly mandatory that at least one item must be present in these lists.

[hexabinaer]

+1 for this approach. Empty contacts just don't make sense with those maintenance types.

Mind my broadening the discussion?

I was wondering why only one value is allowed. We have the following scenario:

OpenCulturas is freely available and actively maintained. But we can also provide/arrange contracts for those who feel better with a full-service offer including hosting, customizations and regular updates. Therefore it really gave us headaches to decide in favor or against maintenance/community, maintenance/contract.