# Package org.eclipse.equinox.p2.metadata

package org.eclipse.equinox.p2.metadata
Defines the metadata being handled by p2.

## Package Specification

This API package defines the constructs being manipulated by p2 such as installable units.

Since:
  2.0

Related Packages
Package
Description
org.eclipse.equinox.p2.metadata.expression
Provides a simple expression language used to represent requirements and filters in the metadada
org.eclipse.equinox.p2.metadata.index
Provides classes for metadata query indexing
org.eclipse.equinox.p2.metadata.io
Class
Description
IArtifactKey
Provide standardised artifact information to uniquely identify the corresponding bytes (perhaps not stored as a file).
ICopyright
The `ICopyright` interface represents a software copyright.
IInstallableUnit
An installable unit represents an atomic, indivisible unit of installable functionality in a provisioned system.
IInstallableUnitFragment
Represents a fragment that contributes additional requirements, capabilities, and other properties to some host installable unit.
IInstallableUnitPatch
An installable unit patch is an installable unit that alters the required capabilities of another installable unit.
ILicense
The `ILicense` interface represents a software license.
IProvidedCapability
Describes a capability that is exposed by an installable unit.
IRequirement
A requirement represents some external constraint on an `IInstallableUnit`.
IRequirementChange
ITouchpointData
ITouchpoint data instances contain the additional information needed by a touchpoint to execute each engine phase it participates in.
ITouchpointInstruction
A touchpoint instruction contains either a sequence of instruction statements to be executed during a particular engine phase, or some simple string value that is needed by a touchpoint to execute its phases.
ITouchpointType
Identifies a particular touchpoint.
IUpdateDescriptor
An update descriptor is attached to an installable unit to describe what that installable unit is capable of acting as an update for.
IVersionedId
An interface representing a (id,version) pair.
IVersionFormat
The IVersionFormat represents the Omni Version Format in compiled form.
KeyWithLocale
A key that can be used to extract a localized property for a specified Locale
MetadataFactory
A factory class for instantiating various p2 metadata objects.
MetadataFactory.InstallableUnitDescription
A description containing information about an installable unit.
MetadataFactory.InstallableUnitFragmentDescription
A description containing information about an installable unit fragment.
MetadataFactory.InstallableUnitPatchDescription
A description containing information about an installable unit patch.
Version
A class that represents a Version in the Omni Version format.
VersionedId
An object representing a (id,version) pair.
VersionFormatException
Exception thrown when parsing Omni Version formats.
VersionRange
This class represents a version range with Omni Version bounds.