[]
Adds a property to metadata. Note that only allowed namespaces are:
"http://purl.org/dc/elements/1.1/" (Dublin Core Properties)
"http://ns.adobe.com/xap/1.0/" (XMP Core Properties)
"http://ns.adobe.com/pdf/1.3/" (PDF Properties)
Trying to add a property with another namespace will throw an exception.public void AddProperty(string ns, string name, string value)
Public Sub AddProperty(ns As String, name As String, value As String)