Package Capability and Requirement Namespace.

A resource provides zero or more package capabilities (this is, exported packages) and requires zero or more package requirements (that is, imported packages).

This class defines the names for the attributes and directives for this namespace. All unspecified capability attributes are of type String and are used as arbitrary matching attributes for the capability. The values associated with the specified directive and attribute keys are of type String, unless otherwise indicated.

Unless otherwise noted, all directives specified on the Export-Package header are visible in the capability and all directives specified on the Import-Package and DynamicImport-Package headers are visible in the requirement.

• The effective directives must be ignored. This namespace is only effective at resolve time. An effective directive specified on the Export-Package, Import-Package or DynamicImport-Package headers must be ignored. An effective directive must not be present in a capability or requirement.
• The cardinality directive has limited applicability to this namespace. A cardinality directive specified on the Import-Package or DynamicImport-Package headers must be ignored. Only requirements with resolution set to dynamic and the package name contains a wildcard must have the cardinality directive set to multiple. Otherwise, a cardinality directive must not be present in a requirement.