This is a baseline application profile for technical metadata properties attached to binary objects in a repository.

For specific formats (image, video, web archive) other properties will be useful. In general, we encourage reusing existing vocabularies, particularly those vocabularies that are both actively maintained and those that are already used by this profile.

Namespaces

Prefix	Namespace
ebucore	http://www.ebu.ch/metadata/ontologies/ebucore/ebucore#
rdfs	http://www.w3.org/2000/01/rdf-schema#
premis	http://www.loc.gov/premis/rdf/v1#
rdf	http://www.w3.org/1999/02/22-rdf-syntax-ns#
pronom	(unpublished)
sweetjpl	http://sweet.jpl.nasa.gov/2.2/reprDataFormat.owl#

Properties

Property name: ebucore:filename

URI	http://www.ebu.ch/metadata/ontologies/ebucore/ebucore#filename
Label	File Name
Definition	The name of the file containing the Resource.
Subproperty of
Equivalent property	nfo:fileName, premis:hasOriginalName
Domain	ebucore:Resource
Range	xsd:string
Obligation & Occurrence	Required (Minimum: 1, Maximum: 1)
Example	yul-269695.OBJ.pdf
Comment

Property name: ebucore:fileSize

URI	http://www.ebu.ch/metadata/ontologies/ebucore/ebucore#fileSize
Label	File Size
Definition	to provide the size of a MediaResource in bytes.
Subproperty of
Equivalent property	nfo:fileSize, dct:extent, premis:hasSize
Domain	ebucore:Resource
Range	xsd:integer
Obligation & Occurrence	Required (Minimum: 1, Maximum: 1)
Example	709162
Comment

Property name: rdfs:label

URI	http://www.w3.org/2000/01/rdf-schema#label
Label	Label
Definition	Descriptive label
Subproperty of
Equivalent property
Domain
Range	xsd:string
Obligation & Occurrence	Recommended (Minimum: 0, Maximum: 1)
Example	Unmodified original
Comment

Property name: ebucore:dateCreated

URI	http://www.ebu.ch/metadata/ontologies/ebucore/ebucore#dateCreated
Label	Date Created
Definition	The date of creation of the media resource.
Subproperty of	dct:date
Equivalent property	nfo:fileCreated, dct:created
Domain	ebucore:Resource
Range
Obligation & Occurrence	Recommended (Minimum: 0, Maximum: 1)
Example	2013-11-29T13:56:46-04:00
Comment

Property name: premis:hasMessageDigest

URI	http://www.loc.gov/premis/rdf/v1#hasMessageDigest
Label	File Hash
Definition	The output of the message digest algorithm.
Subproperty of
Equivalent property	ebucore:hash, nfo:hasHash
Domain	premis:Fixity
Range	xsd:string
Obligation & Occurrence	Recommended (Minimum: 0, Maximum: n)
Example	7c9b35da4f2ebd436f1cf88e5a39b3a257edf4a22be3c955ac49da2e2107b67a1924419563
Comment

Property name: premishash:md5

URI	http://id.loc.gov/vocabulary/preservation/cryptographicHashFunctions/md5
Label	MD5 checksum
Definition	The MD5 checksum of the file content
Subproperty of
Equivalent property
Domain
Range
Obligation & Occurrence	Optional (Minimum: 0, Maximum: 1)
Example	d3b07384d113edec49eaa6238ad5ff00
Comment	See the PREMIS crypographic hash functions for recording other types of checksums.

Property name: rdf:type

URI	http://www.w3.org/1999/02/22-rdf-syntax-ns#type
Label	File Format Type
Definition	Category or Genre of the File
Subproperty of
Equivalent property
Domain	rdf:Resource
Range	pcdm:Document
Obligation & Occurrence	Recommended (Minimum: 0, Maximum: 1)
Example	pcdm:Presentation
Comment

Property name: ebucore:hasMimeType

URI	http://www.ebu.ch/metadata/ontologies/ebucore/ebucore#hasMimeType
Label	Has Mime Type
Definition
Subproperty of
Equivalent property	dct:format, pronom:internetMediaType
Domain
Range	xsd:string
Obligation & Occurrence	Recommended (Minimum: 0, Maximum: 1)
Example	application/pdf
Comment	Another possible equivalent property could be premis:hasFormatName.

Property name: ebucore:dateModified

URI	http://www.ebu.ch/metadata/ontologies/ebucore/ebucore#dateModified
Label	Date Modified
Definition	To indicate the date at which the media resource has been modified.
Subproperty of	dct:modified
Equivalent property	nfo:fileLastModified, dct:modified
Domain
Range
Obligation & Occurrence	Optional (Minimum: 0, Maximum: 1)
Example	2013-11-29T13:56:46-04:00
Comment

Property name: pronom:puid

URI
Label	File Format
Definition	Pronom ID to uniquely identify file format
Subproperty of
Equivalent property	premis:hasFormatName + premis:hasFormatVersion
Domain
Range	xsd:string
Obligation & Occurrence	Optional (Minimum: 0, Maximum: 1)
Example	fmt/20
Comment	Here the equivalent property should be premis:hasFormatRegistryKey.

Property name: sweetjpl:hasByteOrder

URI	http://sweet.jpl.nasa.gov/2.2/reprDataFormat.owl#hasByteOrder
Label	Byte Order
Definition
Subproperty of
Equivalent property
Domain
Range	sweetjpl:ByteOrder
Obligation & Occurrence	Optional (Minimum: 0, Maximum: 1)
Example	http://sweet.jpl.nasa.gov/2.2/reprDataFormat.owl#LittleEndian
Comment

Distinguishing Between Archival Objects and Derivatives

- Utilize the File Use Vocabulary
- See c orresponding implementation inside the PCDM:
  https://github.com/duraspace/pcdm/blob/master/pcdm-ext/use.rdf

Detailed Technical Metadata Captured as XML

If you are using a detailed technical metadata, such as FITS output, and you have a NonRdfSource repository Object, the following recommendation conforms to PCDM structure:

- The PCDM documentation suggests using a hasRelatedFile property for these types of files
- Use the iana:describes / iana:describedBy properties to link such "related" files to their source files. E.g.:
  <> a pcdm:Object ;
  pcdm:hasFile </some/source/file> ;
  pcdm:hasRelatedFile </some/fits/xml/output> .
  </some/source/file> a pcdm:File .
  </some/fits/xml/output> a pcdm:File ;
  iana:describes </some/source/file> .

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