'Declaration Public Property Subtype As System.String
public System.string Subtype {get; set;}
According to the PDF specification the value may be GTS_PDFX, GTS_PDFA1, ISO_PDFE1 or a key defined by an ISO 32000 extension. GcPdf allows setting this property to any value, the user is responsible for the correctness of the data.
This value is "GTS_PDFA1" by default.'Declaration Public Property Subtype As System.String
public System.string Subtype {get; set;}