# Package org.apache.poi.openxml4j.opc

- Interface Summary
  Interface | Description
  --- | ---
  PackageNamespaces | Open Packaging Convention namespaces URI.
  PackageProperties | Represents the core properties of an OPC package.
  PackageRelationshipTypes | Relationship types.
  RelationshipSource |

- Class Summary
  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 Summary
  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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