Use case

Hello Syncfusion Support Team,

I hope you’re doing well. I am building a client-side Flutter application using syncfusion_flutter_pdf: ^29.1.40 to produce fully compliant PDF/A-3b invoices (Factur-X) with an embedded XML attachment. So far, I am:
Generating a base PDF via my existing template service.

Re-loading it into PdfDocument(conformanceLevel: PdfConformanceLevel.a3b).
Adding the Factur-X XML as a PdfAttachment (relationship alternative).
When I validate the result with VeraPDF / Adobe Preflight, I still get errors for:
Missing OutputIntent (no ICC profile embedded, so /OutputIntent is not present).
Missing XMP metadata stream (/Metadata key not found, no XMP schemas like PDF/A ID, Dublin Core, etc.).

I’d like to avoid any server-side or third-party conversion step (e.g. Ghostscript) and rely purely on the Flutter SDK to produce a valid PDF/A-3b.

Could you please advise:
Which Syncfusion Flutter PDF APIs or properties allow embedding an ICC output intent (e.g. sRGB profile)?
How to inject the required XMP metadata (basic PDF/A schemas) into the document?
If these features are not yet exposed in the Flutter package, is there a planned timeline for adding full OutputIntent and XMP support?
Any recommended client-side workaround using only Syncfusion libraries?

Thank you for your help. Having native support for OutputIntent and XMP metadata would greatly simplify client-side PDF/A-3b generation without external dependencies.

Best regards,

Proposal

Add native support in syncfusion_flutter_pdf for full PDF/A-3b compliance without external tools:

1. Embed an ICC OutputIntent

   • Expose a new API (e.g. PdfDocument.addOutputIntent or PdfOutputIntent class)
   • Allow passing a byte array of an ICC profile (sRGB, etc.) and associated metadata
   • Automatically write the /OutputIntent dictionary into the PDF catalog

2. Inject XMP metadata stream

   • Provide a DocumentInformation.xmpMetadata property returning an XmpMetadata wrapper
   • Expose common schemas (BasicSchema, DublinCoreSchema, PDFSchema, pdfaid:part/conformance)
   • Automatically add a /Metadata entry in the document catalog pointing to the embedded XMP

3. Ensure the generated PDF/A-3b passes preflight without Ghostscript or server-side conversion

   • Unit tests and sample code demonstrating a single-step Flutter-only workflow