given the Relationship and ResourceName production in VOResource-v1.0.xsd, the related_id (filled by @ivo-id) is NULLable as attributes are optional by default
ditto for AccessURL/@use
git ignore for unique pruned results
added source and filename columns in resourcecontent and changed intf_param:std type to BOOLEAN (from INTEGER)
wip (good path), trying to make sense of the multiple duplicate exceptions so I've devised this summary print-out to figure out what's going on