## Nepomuk File Ontology (NFO): About files and other desktop resources.

Authors:
  - Tracker Developers
  - Ludger van Elst, DFKI, <elst@dfki.uni-kl.de>
  - Michael Sintek, DFKI, <michael.sintek@dfki.de>
  - Leo Sauermann, DFKI, <leo.sauermann@dfki.de>
  - Antoni Mylka, DFKI, <antoni.mylka@dfki.de>
Editors:
  - Antoni Mylka, DFKI, <antoni.mylka@dfki.de>
  - Tracker developers (translation into turtle)
Contributors:
  - Christiaan Fluit, Aduna, <christiaan.fluit@aduna-software.com>
  - Evgeny 'phreedom' Egorochkin, KDE Strigi Developer, <stexx@mail.ru>
Upstream:

  Upstream version

ChangeLog:

  Tracker changes

Copyright:

  © 2007 DFKI © 2009 Nokia. The ontologies are made available under the terms of NEPOMUK software license (FIXME verify)

## NFO Ontology Classes

### nfo:FileDataObject

A resource containing a finite sequence of bytes with arbitrary information, that is available to a computer program and is usually based on some kind of durable storage. A file is durable in the sense that it remains available for programs to use after the current program has finished.

`Superclasses` : | nie:DataObject,
`Subclasses` : | nfo:DeletedResource, nfo:EmbeddedFileDataObject, nfo:RemoteDataObject,
`In domain of` : | nfo:fileLastModified, nfo:fileOwner, nfo:hasHash, nfo:fileName, nfo:permissions, nfo:fileSize, nfo:fileCreated, nfo:fileLastAccessed,
`In range of` : | --

### nfo:Video

A video file.

`Superclasses` : | nfo:Visual,
`Subclasses` : | --
`In domain of` : | nfo:averageVideoBitrate, nfo:frameCount, nfo:frameRate,
`In range of` : | --

### nfo:MediaList

A file containing a list of media files.e.g. a playlist

`Superclasses` : | nie:InformationElement,
`Subclasses` : | --
`In domain of` : | nfo:mediaListEntry, nfo:listDuration, nfo:entryCounter, nfo:hasMediaFileListEntry,
`In range of` : | --

### nfo:Executable

An executable file.

`Superclasses` : | nie:InformationElement,
`Subclasses` : | --
`In domain of` : | --
`In range of` : | --

### nfo:SoftwareCategory

A software category

`Superclasses` : | nie:InformationElement, nfo:DataContainer,
`Subclasses` : | --
`In domain of` : | nfo:softwareCategoryIcon,
`In range of` : | --

### nfo:SourceCode

Code in a compilable or interpreted programming language.

`Superclasses` : | nfo:PlainTextDocument,
`Subclasses` : | --
`In domain of` : | nfo:definesGlobalVariable, nfo:definesFunction, nfo:definesClass, nfo:programmingLanguage, nfo:commentCharacterCount,
`In range of` : | --

### nfo:RemotePortAddress

An address specifying a remote host and port. Such an address can be interpreted in many ways (examples of such interpretations include mailboxes, websites, remote calendars or filesystems), depending on an interpretation, various kinds of data may be extracted from such an address.

`Superclasses` : | nie:DataObject,
`Subclasses` : | --
`In domain of` : | --
`In range of` : | --

### nfo:Cursor

A Cursor.

`Superclasses` : | nfo:RasterImage,
`Subclasses` : | --
`In domain of` : | --
`In range of` : | --

### nfo:RegionOfInterest

Area on an image with relevant content. Following the spec in http://www.metadataworkinggroup.org

`Superclasses` : | nie:InformationElement,
`Subclasses` : | --
`In domain of` : | nfo:roiRefersTo, nfo:regionOfInterestType, nfo:regionOfInterestHeight, nfo:regionOfInterestWidth, nfo:regionOfInterestY, nfo:regionOfInterestX,
`In range of` : | nfo:hasRegionOfInterest,

### nfo:Document

A generic document. A common superclass for all documents on the desktop.

`Superclasses` : | nie:InformationElement,
`Subclasses` : | nfo:HelpDocument, nfo:Note, nfo:MindMap, nfo:Spreadsheet, nfo:Presentation, nfo:TextDocument,
`In domain of` : | nfo:tableOfContents,
`In range of` : | --

### Note:

This class notifies about changes

### http://www.tracker-project.org/ontologies/poi#ObjectOfInterest

`Superclasses` : | rdfs:Resource,
`Subclasses` : | --
`In domain of` : | --
`In range of` : | nfo:depicts,

### nfo:Presentation

A Presentation made by some presentation software (Corel Presentations, OpenOffice Impress, MS Powerpoint etc.)

`Superclasses` : | nfo:Document,
`Subclasses` : | --
`In domain of` : | --
`In range of` : | --

### nfo:RemoteDataObject

A file data object stored at a remote location. Don't confuse this class with a RemotePortAddress. This one applies to a particular resource, RemotePortAddress applies to an address, that can have various interpretations.

`Superclasses` : | nfo:FileDataObject,
`Subclasses` : | --
`In domain of` : | --
`In range of` : | --

### nfo:Software

A piece of software. Examples may include applications and the operating system. This interpretation most commonly applies to SoftwareItems.

`Superclasses` : | nie:InformationElement,
`Subclasses` : | nfo:SoftwareApplication, nfo:Application, nfo:OperatingSystem,
`In domain of` : | nfo:softwareCmdLine, nfo:softwareIcon, nfo:supercedes, nfo:conflicts,
`In range of` : | nfo:supercedes, nfo:conflicts,

### nfo:ArchiveItem

A file entity inside an archive.

`Superclasses` : | nfo:EmbeddedFileDataObject,
`Subclasses` : | --
`In domain of` : | nfo:isPasswordProtected,
`In range of` : | --

### nfo:HardDiskPartition

A partition on a hard disk

`Superclasses` : | nie:DataObject,
`Subclasses` : | --
`In domain of` : | --
`In range of` : | --

### nfo:Font

A font.

`Superclasses` : | nie:InformationElement,
`Subclasses` : | --
`In domain of` : | nfo:foundry, nfo:fontFamily,
`In range of` : | --

### nfo:FilesystemImage

An image of a filesystem. Instances of this class may include CD images, DVD images or hard disk partition images created by various pieces of software (e.g. Norton Ghost)

`Superclasses` : | nfo:Filesystem,
`Subclasses` : | --
`In domain of` : | --
`In range of` : | --

### nfo:HelpDocument

User guides and similar to assist the user

`Superclasses` : | nfo:Document,
`Subclasses` : | --
`In domain of` : | --
`In range of` : | --

### nfo:DeletedResource

A file entity that has been deleted from the original source. Usually such entities are stored within various kinds of 'Trash' or 'Recycle Bin' folders.

`Superclasses` : | nfo:FileDataObject,
`Subclasses` : | --
`In domain of` : | nfo:deletionDate, nfo:originalLocation,
`In range of` : | --

### nfo:RasterImage

A raster image.

`Superclasses` : | nfo:Image,
`Subclasses` : | nfo:Cursor,
`In domain of` : | --
`In range of` : | --

### nfo:MindMap

A MindMap, created by a mind-mapping utility. Examples might include FreeMind or mind mapper.

`Superclasses` : | nfo:Document,
`Subclasses` : | --
`In domain of` : | --
`In range of` : | --

### nfo:Note

Usually small document with snippets, reminders or frequenly used content.

`Superclasses` : | nfo:Document,
`Subclasses` : | --
`In domain of` : | --
`In range of` : | --

### nfo:PlainTextDocument

A file containing plain text (ASCII, Unicode or other encodings). Examples may include TXT, HTML, XML, program source code etc.

`Superclasses` : | nfo:TextDocument,
`Subclasses` : | nfo:SourceCode, nfo:HtmlDocument,
`In domain of` : | --
`In range of` : | --

### nfo:Spreadsheet

A spreadsheet, created by a spreadsheet application. Examples might include Gnumeric, OpenOffice Calc or MS Excel.

`Superclasses` : | nfo:Document,
`Subclasses` : | --
`In domain of` : | --
`In range of` : | --

### nfo:Trash

Represents a container for deleted files, a feature common in modern operating systems.

`Superclasses` : | nfo:DataContainer,
`Subclasses` : | --
`In domain of` : | --
`In range of` : | --

### nfo:Media

A piece of media content. This class may be used to express complex media containers with many streams of various media content (both aural and visual).

`Superclasses` : | nie:InformationElement,
`Subclasses` : | nfo:Audio, nfo:Visual,
`In domain of` : | nfo:lastPlayedPosition, nfo:equipment, nfo:genre, nfo:averageBitrate, nfo:bitrateType, nfo:encodedBy, nfo:codec, nfo:bitDepth, nfo:hasMediaStream, nfo:compressionType, nfo:duration, nfo:count,
`In range of` : | --

### nfo:SoftwareService

A service published by a piece of software, either by an operating system or an application. Examples of such services may include calendar, addresbook and mailbox managed by a PIM application. This category is introduced to distinguish between data available directly from the applications (Via some Interprocess Communication Mechanisms) and data available from files on a disk. In either case both DataObjects would receive a similar interpretation (e.g. a Mailbox) and wouldn't differ on the content level.

`Superclasses` : | nie:DataObject,
`Subclasses` : | --
`In domain of` : | --
`In range of` : | --

### nfo:VectorImage

`Superclasses` : | nfo:Image,
`Subclasses` : | --
`In domain of` : | --
`In range of` : | --

### nfo:WebHistory

A web history entry

`Superclasses` : | nie:InformationElement,
`Subclasses` : | --
`In domain of` : | nfo:uri, nfo:domain,
`In range of` : | --

### Note:

This class notifies about changes

### nfo:HtmlDocument

A HTML document, may contain links to other files.

`Superclasses` : | nfo:PlainTextDocument,
`Subclasses` : | --
`In domain of` : | --
`In range of` : | --

### nfo:TextDocument

A text document

`Superclasses` : | nfo:Document,
`Subclasses` : | nfo:PaginatedTextDocument, nfo:PlainTextDocument,
`In domain of` : | nfo:characterCount, nfo:lineCount, nfo:wordCount,
`In range of` : | --

### nfo:SoftwareItem

A DataObject representing a piece of software. Examples of interpretations of a SoftwareItem include an Application and an OperatingSystem.

`Superclasses` : | nie:DataObject,
`Subclasses` : | --
`In domain of` : | --
`In range of` : | --

### nfo:OperatingSystem

An OperatingSystem

`Superclasses` : | nfo:Software,
`Subclasses` : | --
`In domain of` : | --
`In range of` : | --

### nfo:PaginatedTextDocument

A file containing a text document, that is unambiguously divided into pages. Examples might include PDF, DOC, PS', DVI etc.

`Superclasses` : | nfo:TextDocument,
`Subclasses` : | --
`In domain of` : | nfo:pageCount,
`In range of` : | --

### nfo:MediaFileListEntry

A single node in the list of media files contained within an MediaList instance. This class is intended to provide a type all those links have. In valid NRL untyped resources cannot be linked. There are no properties defined for this class but the application may expect rdf:first and rdf:last links. The former points to the DataObject instance, interpreted as Media the latter points at another MediaFileListEntr. At the end of the list there is a link to rdf:nil.

`Superclasses` : | rdfs:Resource,
`Subclasses` : | --
`In domain of` : | nfo:entryUrl, nfo:listPosition,
`In range of` : | nfo:hasMediaFileListEntry,

### nfo:Folder

A folder/directory. Examples of folders include folders on a filesystem and message folders in a mailbox.

`Superclasses` : | nfo:DataContainer,
`Subclasses` : | --
`In domain of` : | --
`In range of` : | --

### nfo:Filesystem

A filesystem. Examples of filesystems include hard disk partitions, removable media, but also images thereof stored in files.

`Superclasses` : | nfo:DataContainer,
`Subclasses` : | nfo:FilesystemImage,
`In domain of` : | --
`In range of` : | --

### nfo:Image

A file containing an image.

`Superclasses` : | nfo:Visual,
`Subclasses` : | nfo:Icon, nfo:VectorImage, nfo:RasterImage,
`In domain of` : | nfo:hasRegionOfInterest, nfo:depicts, nfo:orientation, nfo:horizontalResolution, nfo:verticalResolution,
`In range of` : | nfo:softwareIcon, nfo:softwareCategoryIcon,

### Note:

This class notifies about changes

### nfo:CompressionType

Type of compression. Instances of this class represent the limited set of values allowed for the nfo:compressionType property.

`Superclasses` : | rdfs:Resource,
`Subclasses` : | --
`In domain of` : | --
`In range of` : | nfo:compressionType,

### nfo:FileHash

A fingerprint of the file, generated by some hashing function.

`Superclasses` : | rdfs:Resource,
`Subclasses` : | --
`In domain of` : | nfo:hashAlgorithm, nfo:hashValue,
`In range of` : | nfo:hasHash,

### nfo:MediaStream

A stream of multimedia content, usually contained within a media container such as a movie (containing both audio and video) or a DVD (possibly containing many streams of audio and video). Most common interpretations for such a DataObject include Audio and Video.

`Superclasses` : | nie:DataObject,
`Subclasses` : | --
`In domain of` : | --
`In range of` : | --

### nfo:Attachment

A file attached to another data object. Many data formats allow for attachments: emails, vcards, ical events, id3 and exif...

`Superclasses` : | nfo:EmbeddedFileDataObject,
`Subclasses` : | --
`In domain of` : | --
`In range of` : | --

### nfo:Equipment

The equipment used to create media

`Superclasses` : | nie:InformationElement,
`Subclasses` : | --
`In domain of` : | nfo:equipmentSoftware, nfo:model, nfo:manufacturer,
`In range of` : | nfo:equipment,

### nfo:Website

A website, usually a container for remote resources, that may be interpreted as HTMLDocuments, images or other types of content.

`Superclasses` : | nie:InformationElement,
`Subclasses` : | --
`In domain of` : | --
`In range of` : | --

### nfo:Application

An application

`Superclasses` : | nfo:Software,
`Subclasses` : | --
`In domain of` : | --
`In range of` : | --

### nfo:EmbeddedFileDataObject

A file embedded in another data object. There are many ways in which a file may be embedded in another one. Use this class directly only in cases if none of the subclasses gives a better description of your case.

`Superclasses` : | nfo:FileDataObject,
`Subclasses` : | nfo:ArchiveItem, nfo:Attachment,
`In domain of` : | nfo:encoding,
`In range of` : | --

### nfo:DataContainer

A superclass for all entities, whose primary purpose is to serve as containers for other data object. They usually don't have any 'meaning' by themselves. Examples include folders, archives and optical disc images.

`Superclasses` : | nie:InformationElement,
`Subclasses` : | nfo:SoftwareCategory, nfo:Archive, nfo:Trash, nfo:Filesystem, nfo:Folder,
`In domain of` : | --
`In range of` : | nfo:belongsToContainer,

### Note:

This class notifies about changes

### nfo:BookmarkFolder

A folder with bookmarks of a webbrowser. Use nfo:containsBookmark to relate Bookmarks. Folders can contain subfolders, use containsBookmarkFolder to relate them.

`Superclasses` : | nie:InformationElement,
`Subclasses` : | --
`In domain of` : | nfo:containsBookmark, nfo:containsBookmarkFolder,
`In range of` : | nfo:containsBookmarkFolder,

### Note:

This class notifies about changes

### nfo:Audio

A file containing audio content

`Superclasses` : | nfo:Media,
`Subclasses` : | --
`In domain of` : | nfo:audioOffset, nfo:peakGain, nfo:gain, nfo:rearChannels, nfo:averageAudioBitrate, nfo:sampleRate, nfo:frontChannels, nfo:bitsPerSample, nfo:sampleCount, nfo:lfeChannels, nfo:sideChannels, nfo:channels,
`In range of` : | --

### Note:

This class notifies about changes

### nfo:Archive

A compressed file. May contain other files or folder inside.

`Superclasses` : | nfo:DataContainer,
`Subclasses` : | --
`In domain of` : | nfo:uncompressedSize,
`In range of` : | --

### nfo:Visual

File containing visual content.

`Superclasses` : | nfo:Media,
`Subclasses` : | nfo:Video, nfo:Image,
`In domain of` : | nfo:colorDepth, nfo:width, nfo:height, nfo:interlaceMode, nfo:tilt, nfo:heading, nfo:aspectRatio,
`In range of` : | --

### nfo:Icon

An Icon (regardless of whether it's a raster or a vector icon. A resource representing an icon could have two types (Icon and Raster, or Icon and Vector) if required.

`Superclasses` : | nfo:Image,
`Subclasses` : | --
`In domain of` : | --
`In range of` : | --

### nfo:RegionOfInterestContent

Content in the area. There is a predefined set of contents in the spec: http://www.metadataworkinggroup.org

`Superclasses` : | nie:InformationElement,
`Subclasses` : | --
`In domain of` : | --
`In range of` : | nfo:regionOfInterestType,
`Predefined instances` : | nfo:roi-content-undefined, nfo:roi-content-barcode, nfo:roi-content-focus, nfo:roi-content-pet, nfo:roi-content-face,

### nfo:Bookmark

A bookmark of a webbrowser. Use nie:title for the name/label, nie:contentCreated to represent the date when the user added the bookmark, and nie:contentLastModified for modifications. nfo:bookmarks to store the link.

`Superclasses` : | nie:InformationElement,
`Subclasses` : | --
`In domain of` : | nfo:streamDuration, nfo:streamPosition, nfo:pageNumber, nfo:characterPosition, nfo:bookmarks,
`In range of` : | nfo:containsBookmark,

### Note:

This class notifies about changes

### nfo:SoftwareApplication

An application

`Superclasses` : | nfo:Software,
`Subclasses` : | --
`In domain of` : | --
`In range of` : | --

### Note:

This class notifies about changes

### nfo:Orientation

Orientation enum

`Superclasses` : | rdfs:Resource,
`Subclasses` : | --
`In domain of` : | --
`In range of` : | nfo:orientation,
`Predefined instances` : | nfo:orientation-left, nfo:orientation-right-mirror, nfo:orientation-right, nfo:orientation-left-mirror, nfo:orientation-bottom-mirror, nfo:orientation-bottom, nfo:orientation-top-mirror, nfo:orientation-top,