When I make a search request to get release-groups relevant to some criteria (e.g.: http://musicbrainz.org/ws/2/release-group?query=%22News%20of%20the%20world%22 )unfortunately "release" elements do not contain "year" for this releases. It would be very great to add this attribute into "release" elements. It will help avoiding additional requests to get year for EACH release.
Or at least it would be very helpful to add "first-release-date" element for each "release-groups" in this search result. Something like this:
<release-group-list count="3" offset="0">
<release-group id="a5b25e78-2c46-3c59-ab07-e022d88699ed" type="Album" ext:score="100">
<title>Keeper of the Seven Keys, Part I</title>
Many thanks for your cool project!