Returns a copy that role-maps the custom structure type type to standardType.
public FlowTagging WithRoleMapping(string type, string standardType)
A structure type that is not standard.
A type standard in both the PDF 1.7 and the PDF 2.0 namespaces (such as P, H1, Div,
Span, Figure).
ISO 32000-2 §14.8.6.2.