@prefix schema: <https://schema.org/> .
@prefix af: <https://anchorfact.org/ns#> .

<https://anchorfact.org/kb/history/viking-age>
  a schema:TechArticle ;
  schema:headline "Viking Age" ;
  schema:url <https://anchorfact.org/history/viking-age/> ;
  af:status "public" ;
  af:confidence "low" ;
  af:confidenceScore "0.555" ;
  af:confidenceBasis "verified_sources" ;
  af:generationMethod "ai_structured" .

<https://anchorfact.org/kb/history/viking-age>
  schema:citation <https://press.princeton.edu/books/hardcover/9780691149851/the-age-of-the-vikings> ;
  af:sourceTier "B" .