dotnet/wpf · error · FileFormatException

SR.XpsValidatingLoaderMoreThanOnePrintTicketPart

Error message

SR.XpsValidatingLoaderMoreThanOnePrintTicketPart

What it means

Per the XPS spec, a FixedDocumentSequence, FixedDocument, or FixedPage part may have at most one PrintTicket relationship. XpsS0FixedPageSchema.ValidateRelationships counts relationships of the PrintTicket type on the part and throws FileFormatException as soon as a second one is found.

Solutions

1. Remove duplicate PrintTicket relationships so each FDS/FD/FP part has at most one (delete extra rels via part.DeleteRelationship or rebuild the package).
2. Keep a single job-level PrintTicket at the FixedDocumentSequence level and remove per-document/per-page duplicates.
3. Rebuild the relationship list programmatically before loading: enumerate GetRelationshipsByType and prune to one.
4. Re-export the XPS from the original producer after fixing ticket attachment logic.

Example fix

// before
part.CreateRelationship(printTicketUri, TargetMode.Internal, printTicketRelType); // adds a second ticket rel
// after
if (!part.GetRelationshipsByType(printTicketRelType).Any())
    part.CreateRelationship(printTicketUri, TargetMode.Internal, printTicketRelType);

const string printTicketRel = "http://schemas.microsoft.com/xps/2005/06/required-resource:printticket";
var ticketRels = fixedPart.GetRelationshipsByType(printTicketRel).ToList();
if (ticketRels.Count > 1)
    ticketRels.Skip(1).ToList().ForEach(r => fixedPart.DeleteRelationship(r.Id));

static bool HasSinglePrintTicket(PackagePart part, string relType) =>
    part.GetRelationshipsByType(relType).Cast<PackageRelationship>().Take(2).Count() <= 1;

try { loader.Load(packageStream); }
catch (FileFormatException ex) { // duplicate PrintTicket rel: open package read-write, prune rels, retry once
    PruneDuplicatePrintTicketRels(packageStream); loader.Load(packageStream); }

When it happens

Trigger: Opening an XPS package where a FixedDocumentSequence/FixedDocument/FixedPage part has two or more package relationships of type http://schemas.microsoft.com/xps/2005/06/required-resource:PrintTicket (or the printticket rel type); validation enumerates part.GetRelationshipsByType and trips at count>1.

Common situations: Tools merging XPS documents or applying job-level and document-level print tickets by blindly adding relationships; package-editing scripts that append a PrintTicket relationship without removing the existing one; round-tripping through libraries that duplicate relationships.

Understand the failure class

Background: Schema validation failed / invalid input schema: payload rejected because its shape doesn't match the expected schema — this error's family across 28 libraries.

Related errors

• SR.XpsValidatingLoaderMoreThanOneDiscardControlInPackage
• SR.XpsValidatingLoaderMoreThanOneThumbnailPart
• SR.XpsValidatingLoaderPrintTicketHasIncorrectType
• PackagePart has more than one Print Ticket relationship.
• PrintTicket was already committed.

AI-assisted analysis of dotnet/wpf@81131a70a4 (2026-09-14). Data as JSON: /api/errors/a4cb314e6c3ef9ef. Report an issue: GitHub.

Appendix: source

Thrown at src/Microsoft.DotNet.Wpf/src/PresentationFramework/System/Windows/Documents/FixedSchema.cs:550

                                }
                    );
        }

        public override void ValidateRelationships(Package package, Uri packageUri, Uri partUri, ContentType mimeType)
        {
            PackagePart part = package.GetPart(partUri);
            PackageRelationshipCollection checkRels;
            int count;

            // Can only have 0 or 1 PrintTicket per FDS, FD or FP part
            checkRels = part.GetRelationshipsByType(_printTicketRel);
            count = 0;
            foreach (PackageRelationship rel in checkRels)
            {
                count++;
                if (count > 1)
                {
                    throw new FileFormatException(SR.XpsValidatingLoaderMoreThanOnePrintTicketPart);
                }

                // Also check for existence and type
                Uri targetUri = PackUriHelper.ResolvePartUri(partUri, rel.TargetUri);
                Uri absTargetUri = PackUriHelper.Create(packageUri, targetUri);

                PackagePart targetPart = package.GetPart(targetUri);

                if (!_printTicketContentType.AreTypeAndSubTypeEqual(new ContentType(targetPart.ContentType)))
                {
                    throw new FileFormatException(SR.XpsValidatingLoaderPrintTicketHasIncorrectType);
                }
            }

            checkRels = part.GetRelationshipsByType(_thumbnailRel);
            count = 0;
            foreach (PackageRelationship rel in checkRels)
            {

View on GitHub (pinned to 81131a70a4)