| Interface | Description | 
|---|---|
| PackageNamespaces | Open Packaging Convention namespaces URI. | 
| PackageProperties | Represents the core properties of an OPC package. | 
| PackageRelationshipTypes | Relationship types. | 
| RelationshipSource | 
| Class | Description | 
|---|---|
| ContentTypes | Open Packaging Convention content types (see Annex F : Standard Namespaces
 and Content Types). | 
| OPCPackage | Represents a container that can store multiple data objects. | 
| PackagePart | Provides a base class for parts stored in a Package. | 
| PackagePartCollection | A package part collection. | 
| PackagePartName | An immutable Open Packaging Convention compliant part name. | 
| PackageRelationship | A part relationship. | 
| PackageRelationshipCollection | Represents a collection of PackageRelationship elements that are owned by a
 given PackagePart or the Package. | 
| PackagingURIHelper | Helper for part and pack URI. | 
| StreamHelper | |
| ZipPackage | Physical zip package. | 
| ZipPackagePart | Zip implementation of a PackagePart. | 
| Enum | Description | 
|---|---|
| CertificateEmbeddingOption | Specifies the location where the X.509 certificate that is used in signing is stored. | 
| PackageAccess | Specifies package access. | 
| TargetMode | Specifies whether the target of a PackageRelationship is inside or outside a
 Package. | 
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