OpenPermID-bulk-person-20180916_070349.ttl missing tr-vcard namespace definition

I am following the quite excellent tutorial on loading OpenPermId data (

https://jbarrasa.com/2018/02/01/neo4j-is-your-rdf-store-part-3-thomson-reuters-openpermid/) and discovered that the tr-vcard namespace that is reference on line

51389 of the file

OpenPermID-bulk-person-20180916_070349.ttl

is not defined in the file itself. I added

@prefix tr-vcard: <http://permid.org/ontology/tr-vcard/&gt; .

to the top of the .ttl file, and now it loads. The error I was getting was:

Namespace prefix 'tr-vcard' used but not defined [line 51389]

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