Property DefaultLanguage
DefaultLanguage
Gets the document's default language tag from the document defaults, or null when none is declared.
public string? DefaultLanguage { get; }
Property Value
Remarks
This is the document-wide default (w:docDefaults/w:rPrDefault/w:rPr/w:lang),
not a summary of the languages runs actually use. A tagged PDF needs one value for the
catalog's /Lang, and the declared default is the only honest answer — picking
the most frequent run language, or the first one seen, would be a guess presented to a
screen reader as a fact.