Finds the structure element that owns the marked-content sequence mcid in the content of page.
public PdfStructureElement? FindElement(PdfPage page, int mcid)
The page whose content stream holds the sequence.
The sequence's MCID.
null when the sequence is not a content item.ISO 32000-2 §14.7.5.4: through the page's StructParents entry and the parent tree.