SystemMetadata-class {datapack}

A DataONE SystemMetadata object containing basic identification, ownership, access policy, replication policy, and related metadata.

Description

A class representing DataONE SystemMetadata, which is core information about objects stored in a repository and needed to manage those objects across systems. SystemMetadata contains basic identification, ownership, access policy, replication policy, and related metadata.

Slots

serialVersion

value of type "numeric", the current version of this system metadata; only update the current version

identifier

value of type "character", the identifier of the object that this system metadata describes.

replicationAllowed

value of type "logical", replication policy allows replicas.

numberReplicas

value of type "numeric", for number of supported replicas.

preferredNodes

value of type "list", of preferred member nodes.

blockedNodes

value of type "list", of blocked member nodes.

formatId

value of type "character", the DataONE object format for the object.

size

value of type "numeric", the size of the object in bytes.

checksum

value of type "character", the checksum for the object using the designated checksum algorithm.

checksumAlgorithm

value of type "character", the name of the hash function used to generate a checksum, from the DataONE controlled list.

submitter

value of type "character", the Distinguished Name or identifier of the person submitting the object.

rightsHolder

value of type "character", the Distinguished Name or identifier of the person who holds access rights to the object.

accessPolicy

value of type "data.frame", a list of access rules as (subject, permission) tuples to be applied to the object.

obsoletes

value of type "character", the identifier of an object which this object replaces.

obsoletedBy

value of type "character", the identifier of an object that replaces this object.

archived

value of type "logical", a boolean flag indicating whether the object has been archived and thus hidden.

dateUploaded

value of type "character", the date on which the object was uploaded to a member node.

dateSysMetadataModified

value of type "character", the last date on which this system metadata was modified.

originMemberNode

value of type "character", the node identifier of the node on which the object was originally registered.

authoritativeMemberNode

value of type "character", the node identifier of the node which currently is authoritative for the object.

seriesId

value of type "character", a unique Unicode string that identifies an object revision chain. A seriesId will resolve to the latest version of an object.

mediaType

value of type "character", the IANA Media Type (aka MIME-Type) of the object, e.g. "text/csv".

fileName

value of type "character", the name of the file to create when this object is downloaded from DataONE.

mediaTypeProperty

value of type a "list" of "character", IANA Media Type properties for the "mediaType" argument

Methods

• initialize: Initialize a DataONE SystemMetadata object with default values or values passed in to the constructor object

• SystemMetadata: Create a SystemMetadata object, with all fields set to the value found in an XML document

• parseSystemMetadata: Parse an external XML document and populate a SystemMetadata object with the parsed data

• serializeSystemMetadata: Get the Count of Objects in the Package

• validate: Validate a SystemMetadata object

• addAccessRule: Add access rules to an object such as system metadata

• hasAccessRule: Determine if a particular access rules exists within SystemMetadata.

• clearAccessPolicy: Clear the accessPolicy from the specified object.

See Also

datapack