<?xml version="1.0" encoding="utf-8"?><mads xmlns="http://www.loc.gov/mads/" xmlns:mods="http://www.loc.gov/mods/v3" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.loc.gov/mads/
mads.xsd"><authority><topic authority="http://AATesaurus.cultura.gencat.cat/aat/getty_en">record identifiers</topic></authority><related type="broader"><topic>identification numbers and codes</topic></related><variant type="other"><topic>identifiers, record</topic></variant><variant type="other"><topic>record identifier</topic></variant> <note xml:lang="en"><![CDATA[ Numbers or codes that uniquely identify a record or entity within a given area of a system. Such numbers are typically system-generated; the values may comprise sequential numbers or codes algorithmically constructed. A goal may be to ensure uniqueness across multiple systems, such as UUID or GUID. ]]></note></mads>