You want to use the "sort" filter operator. The syntax is:
sort[fieldname]
which sorts in ascending order, using the values from the indicated field. To sort in descending order, use a "!" prefix, like this:
!sort[fieldname]
Thus, for your requested use-case, you can write something like:
{{{ [tag[mytag]sort[title] }}}
and
{{{ [tag[mytag]!sort[modified] }}}
For documentation about all the filter operators, see:
enjoy,
-e
Eric Shulman
ELS Design Studios
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