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Pdf Library for .NET

PdfDocumentAddXmpExtensionSchema Method

Declares a custom XMP extension schema in the document metadata and writes the values of its properties.

Namespace: SelectPdf.Universal
Assembly: SelectPdf.Universal (in SelectPdf.Universal.dll) Version: 26.4
Syntax
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public void AddXmpExtensionSchema(
	string prefix,
	string namespaceUri,
	string schemaName,
	IDictionary<string, string> properties
)

Parameters

prefix  String
The namespace prefix of the schema, for example "fx".
namespaceUri  String
The namespace URI of the schema.
schemaName  String
A human-readable name for the schema.
properties  IDictionaryString, String
The schema property names, mapped to the values written for this document. Each is declared as an external text property.
Remarks
A PDF/A document may only carry metadata from schemas the standard predefines, unless the schema itself is described inside the XMP packet. This method writes both halves: the schema declaration and the property values.

Use it for custom metadata a recipient needs to find in the document. For ZUGFeRD / Factur-X invoices use AddZugferdInvoice(Stream, ZugferdProfile, PdfAttachmentRelationship), which writes the required schema for you.

See Also