This service delivers (most of) the datasets held at PDS-PPI VO server. In addition to the default (nonstandard) way of just appending accrefs to the get access URL, there is also a very simple datalink service here that, for each dataset, essentially just gives the dataset itself and possibly a preview. More advanced datalink services might be available.
Some datasets may be embargoed, in which case the access yields a 403. Credentials for individual files may be obtained by contacting the site operators.
A simple datalink service for everything that's in DaCHS' product table. This only exposes the dataset itself and its preview, if existing.
The products table keeps information on "products", i.e. datasets delivered to the users.
It is normally fed through the `//products#define`_ rowfilter something like `the //products#table mixin`_ .
/getproducts inspects this table before handing out data to enforce embargoes and similar restrictions, and this is also where it figures out where to go for previews.