Are there any standards, or common usage, for the creation of persistent (long-lived) URLs (web addresses) for genealogy events? (more accurately these would be called IRIs, but URLs are the more well-known term).
For example, Familysearch uses addresses like https://familysearch.org/pal:/MM9.1.1/MJ34-3M4 to refer to a person in an event. Is the "pal:" part of a standard, like perhaps "persistent archive link"? I've been unable to find any documentation on the meaning of the "pal:" prefix, or indeed how stable these addresses are intended to be.
Ancestry and Findmypast don't seem to put any effort into making their pages and records easily addressable. The record returned from a search is often an address like http://search.ancestry.co.uk/cgi-bin/sse.dll?rank=1&new=1&MSAV=1&msT=1&gss=angs-c&gsfn=edgar&gsln=jeffery&uidh=x26&pcat=1881UKI&h=17925715&db=uki1881&indiv=1&ml_rpos=1 . But within that record the individuals do have simpler references: http://search.ancestry.co.uk/cgi-bin/sse.dll?db=uki1881&indiv=try&h=17925715 . I doubt these URLs would be stable (kept available after a major software upgrade).
There are some "persistent URLs" in the academic, museum and library worlds, such as the Archival Resource Key and the Digital Object Identifier. Are there any projects in genealogy to use these or similar persistent identifiers (and is the Familysearch identifier connected to these in any way?).
Once records online are identified with persistent identifiers, the identifiers can be used as source references that can be shared and published, with the knowledge that there's a better chance the reference will still be there in years to come. At present, when a link to a web page is used as part of the source documentation of an event, there's a very good probability the link will be broken eventually (sometimes quite soon).