[GeoNetwork-users] ISO 19115 and series/aggregates

Dear all,
I am writing metadata for geographical datasets, And I would like to use the
aggregates/series for example to relate datasets which are collected during
the same trial.

I have carefully read the Iso 19115 specification but before to write the
metadata for series/aggregates I would like to see some real example.
Does anyone publish metadata where Hierarchy level is set as series?

Would you mind sending me the related web link?

It seems quite difficult to find examples of metadata for
series/aggragates, Are they used in the real word? is there any guidelines,
paper suggesting illustrating the use of aggregation in iso19115 apart from
standard metadata specification?

Any suggestion and comment is welcome,
thanks in advance,
Riccardo Albertoni