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One of the main differences between ERN-3 and ERN-4 is the introduction of a PartyList. Akin to the ResourceList, it allows the label to collate all artists, musicians, writers and labels into a single list and then reference these parties from Releases and Resources. This means that recipients of ERN-4s will be able to be informed whether two sound recordings are recorded by the same John Williams or whether the two John Williams are the same:

Code Block
languagexml
titleERN-3
<!-- In 1st Sound Recording -->
<ResourceContributor>
  <PartyName>
    <FullName>John Williams</FullName>
  </PartyName>
  ...
</ResourceContributor>
 
<!-- In 2nd Sound Recording -->
<ResourceContributor>
  <PartyName>
    <FullName>John Williams</FullName>
  </PartyName>
  ...
</ResourceContributor>
Code Block
languagexml
titleERN-4 (Two John Williamses)
<!-- In 1st Sound Recording -->
<Contributor>
  <ContributorPartyReference>
    P101
  </ContributorPartyReference>
  ...
</Contributor>

<!-- In 2nd Sound Recording -->
<Contributor>
  <ContributorPartyReference>
    P202
  </ContributorPartyReference>
  ...
</Contributor>
Code Block
languagexml
titleERN-4 (One John Williams)
<!-- In 1st Sound Recording -->
<Contributor>
  <ContributorPartyReference>
    P101
  </ContributorPartyReference>
  ...
</Contributor>

<!-- In 2nd Sound Recording -->
<Contributor>
  <ContributorPartyReference>
    P101
  </ContributorPartyReference>
  ...
</Contributor>

The difference between the two John Williamses in the middle example is indicated by the two different values in the ContributorPartyReference element (P101 vs P202).  The above XML snippets rely on these Party definitions:

None

Code Block
languagexml
<Party>
    <PartyReference>P101</PartyReference>
    <PartyName>
        <FullName>
			John Williams
		</FullName>
    </PartyName>
    <PartyId>
        <ISNI>0000 0000 4587 1863</ISNI>
    </PartyId>
</Party>
<Party>
    <PartyReference>P202</PartyReference>
    <PartyName>
        <FullName>
			John Williams
		</FullName>
    </PartyName>
    <PartyId>
        <ISNI>0000 0000 3846 1225</ISNI>
    </PartyId>
</Party>

Code Block
languagexml
<Party>
    <PartyReference>P101</PartyReference>
    <PartyName>
        <FullName>
			John Williams
		</FullName>
    </PartyName>
    <PartyId>
        <ISNI>0000 0000 4587 1863</ISNI>
    </PartyId>
</Party>