[jats-list] citation "year" with suffix

[Alf Eaton <eaton.alf@xxxxxxxxx>]

When marking up reference lists that use "Author, Year" format for
inline citations - so the year has an alphanumeric suffix if more than
one cited article has the same author surname and year - would this be
appropriate markup for the citation?:

====
<ref id="ref-2">
    <element-citation publication-type="journal">
        <person-group person-group-type="author">
            <name>
                <surname>Wedel</surname>
                <given-names>MJ</given-names>
            </name>
        </person-group>
        <article-title>What pneumaticity tells us about
prosauropods</article-title>
        <volume>1</volume>
        <year iso-8601-date="2007">2007b</year>
        <fpage>1</fpage>
    </element-citation>
</ref>
====

There are two examples in
http://jats.nlm.nih.gov/publishing/tag-library/1.0/?elem=year that use
@iso-8601-date on <year>, but they both just repeat the information in
the text content; I'm assuming this attribute was intended for cases
where the text contains something other than the 4-digit year?

Thanks,
Alf