Finds the structure element that owns the marked-content sequence mcid in contentStream, a form XObject or another stream with its own StructParents.
public PdfStructureElement? FindElement(CosStream contentStream, int mcid)
The content stream holding the sequence.
The sequence's MCID.
null.ISO 32000-2 §14.7.5.4, Table 359: MCIDs are scoped to their content stream, so MCID 0 of a form is not MCID 0 of the page.