Aspose.PDF for .NET 26.5

Improvements and Changes

Changes in .NET Framework Package Support

Starting with Aspose.PDF for .NET 26.5, publication of the net40 compatibility package, Aspose.PDF for .NET Framework 4.0 (DLLs only), has resumed. This package was discontinued starting with Aspose.PDF for .NET 26.3.

The package has been republished in response to customer requests for .NET Framework 4.6.2 and .NET Framework 4.7 compatibility, tracked as PDFNET-62130 and PDFNET-62139.

Features and Enhancements

Marker-like PDF Chunking for AI and RAG Workflows

Aspose.PDF for .NET 26.5 introduces Marker-like PDF chunking for AI-driven document processing. This feature addresses issue PDFNET-60708 and enables splitting PDF documents into semantic DocumentChunk objects that can be used in Retrieval-Augmented Generation (RAG), semantic search, and vector indexing workflows.

The new API provides extension methods on Document:

Chunking behavior can be configured with ChunkingOptions, including MaxChunkSize and OverlapSize. The ingestion pipeline is based on Microsoft.Extensions.AI and Microsoft.Extensions.VectorData abstractions, so it can be used with different embedding providers and vector stores.

Here is an example of how to get semantic chunks from a PDF document:

// For complete examples and data files, visit https://github.com/aspose-pdf/Aspose.PDF-for-.NET
private static async Task GetDocumentChunks()
{
    var dataDir = RunExamples.GetDataDir_AsposePdf_AI();

    using (var document = new Aspose.Pdf.Document(dataDir + "RagGuide.pdf"))
    {
        var options = new Aspose.Pdf.AI.ChunkingOptions
        {
            MaxChunkSize = 512,
            OverlapSize = 50
        };

        var chunks = await document.GetChunksAsync(options, sourceId: "my-document");

        foreach (var chunk in chunks)
        {
            Console.WriteLine(string.Format("Chunk {0}: {1}", chunk.Index, chunk.Id));
            Console.WriteLine(chunk.Content);
        }
    }
}

For more details, see PDF Chunking and Embedding.

Signing with Certificate and TSA

Aspose.PDF for .NET 26.5 extends digital signing support for workflows that require certificate-based signatures together with a timestamp authority (TSA). This enhancement addresses issue PDFNET-62072 and adds new constructor overloads for PKCS7 and PKCS7Detached that accept TimestampSettings.

.NET Framework Compatibility Packages

Aspose.PDF for .NET 26.5 restores publication of the .NET Framework compatibility package and helps projects that target legacy .NET Framework versions use the current Aspose.PDF release line. This update addresses PDFNET-62130 for .NET Framework 4.6.2 and PDFNET-62139 for .NET Framework 4.7 package availability.

Other Notable Enhancements and Features

Bug Fixing and Other Changes

Documentation Updates

The PDF Chunking and Embedding article has been added to describe how to split PDF documents into semantic chunks and generate vector embeddings for RAG pipelines and semantic search.

Public API and Backward Incompatible Changes

Added APIs

• Type: Aspose.Pdf.AI.ChunkingOptions
• Type: Aspose.Pdf.AI.DocumentChunk
• Type: Aspose.Pdf.AI.DocumentExtensions
• Method: Aspose.Pdf.AI.ChunkingOptions.#ctor System.Void
• Method: Aspose.Pdf.AI.ChunkingOptions.Validate System.Void
• Method: Aspose.Pdf.AI.DocumentChunk.#ctor(System.String,System.String,System.Int32,System.String) System.Void
• Method: Aspose.Pdf.AI.DocumentChunk.GetVectorDefinition(System.Int32) Microsoft.Extensions.VectorData.VectorStoreCollectionDefinition
• Method: Aspose.Pdf.Forms.PKCS7.#ctor(Aspose.Pdf.TimestampSettings) System.Void
• Method: Aspose.Pdf.Forms.PKCS7Detached.#ctor(Aspose.Pdf.TimestampSettings) System.Void
• Method: Aspose.Pdf.LowCode.TimestampOptions.#ctor System.Void
• Property: Aspose.Pdf.AI.ChunkingOptions.MaxChunkSize System.Int32
• Property: Aspose.Pdf.AI.ChunkingOptions.OverlapSize System.Int32
• Property: Aspose.Pdf.AI.DocumentChunk.Content System.String
• Property: Aspose.Pdf.AI.DocumentChunk.Context System.String
• Property: Aspose.Pdf.AI.DocumentChunk.Embedding System.Nullable
• Property: Aspose.Pdf.AI.DocumentChunk.Id System.String
• Property: Aspose.Pdf.AI.DocumentChunk.Index System.Int32
• Property: Aspose.Pdf.AI.DocumentChunk.Metadata System.Collections.Generic.IDictionary
• Field: Aspose.Pdf.AI.ChunkingOptions.DefaultMaxChunkSize System.Int32
• Field: Aspose.Pdf.AI.ChunkingOptions.DefaultOverlapSize System.Int32
• Field: Aspose.Pdf.AI.ChunkingOptions.MaximumChunkSize System.Int32
• Field: Aspose.Pdf.AI.ChunkingOptions.MinimumChunkSize System.Int32

Removed APIs

No removings.

Backward Incompatible Changes

No changes.