Are you thinking of something similar to what Ancestry currently do with FindAGrave where they just direct to the web page?
No, actually, Ancestry have all this now. That's why I thought it would be easier for them than some new company. I know nothing of their database schema but the meta-data provided by the user could be stored in XML form, and then incorporated into their schema when convenient. This "new collection" would have similar indexes to their other collections (derived fro the XML meta-data) and their search would just treat it like any other collection. The four-column example I've been describing for a POC is actually just three in principle: personal name(s), event(s), relationship(s). For instance, the alternative names by the person is known; the dates and places for events such as birth, death, lived-at; and relationships to other table entries such as father, mother, spouse. It just needs a little thought to create s good UI to handle the multiplicity in each column.