noun
source document type (of a link)
Computing term for the type of the source document in a hyperlink context.
リンクの原始文書型を確認してください。
Please check the source document type of the link.
Compound of 原始 (primitive, original) + 文書 (document) + 型 (type). The exact derivation is uncertain; it is a technical term likely coined in computing contexts.