```{index} single: set_metadata (Cairo::PdfSurface) ``` ```{index} single: Cairo::PdfSurface::set_metadata ``` # set_metadata Sets one document metadata field of the PDF. $pdf->set_metadata('title', 'Quarterly report'); `$metadata` names the field: `'title'`, `'author'`, `'subject'`, `'keywords'`, `'creator'`, `'create-date'` or `'mod-date'`. The two date fields take an ISO 8601 string. Needs cairo 1.16 or newer; on an older library the call dies saying so. Wraps `cairo_pdf_surface_set_metadata`.