ontologies.model.owl Maven / Gradle / Ivy
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WebLab Exchange model v1.2
1.2
WebLab Exchange model v1.2 - August 2010
This version includes annotatable object of the model i.e. Resources and their relationships.
It also provides some properties to be used in annotations.
WEBLAB: Service oriented integration platform for media mining and intelligence applications Copyright (C) 2004 - 2010 CASSIDIAN
Links a Resource to one of its Annotation.
Links a SpatialSegment to one of its Coordinate.
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Links a Resource to one of its LowLevelDescriptor.
Links a ResultSet to its PieceOfKnowledge.
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Links a MediaUnit to one of its Segment.
Links a Query to its parent ComposedQuery.
Links a resource to its parent ComposedResource
Links a MediaUnit to its parent Document.
Links a resource to its parent ResultSet.
Links a Document to one of its sub MediaUnit.
Links a ComposedQuery one of its Query.
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Links a ComposedResource to one of its Resource.
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Links a ResultSet to one of its Resource.
The end value of a LinearSegment or a TemporalSegment.
The start value of a LinearSegment or a TemporalSegment.
Annotation
An Annotation will contain a set of RDF statements which refer to a specific resource or part of resource (segment) known as the subject of the annotations. Thus an annotation object is fully dependent on the resource it describes. So an Annotation is a PieceOfKnowledge but where each statement in its data refers to the resource it depends on. Annotation is one of the major objects manipulated through the WebLab platform since it will allow adding any particular information on any type of WebLab resource. For example, many process services will add annotations in order to link the extracted information to the resource processed (i.e. a language recognition service will annotate a document in order to note the language identified, or perhaps that the language could not be recognised).
Audio
An audio unit describes audio content out of media document. It does not have any particular attribute but only allow describing the structure. As a resource it can be annotated to describe the audio content. It can also be described using low level descriptors. The original content may be in content field or a reference using an annotation should be made to the content.
ComposedQuery
This kind of query is only an aggregation of query using a n-ary boolean operator to combine them. Composing queries using various composed queries will enable to deal with brackets. Please note that when dealing with the operators AND and OR, the number of queries should be at least two to be used; used with a simple query it will have no effects. NOT is a unary operator, so the list of queries should be reduced to one, but when using it in a more-that-one-query list, a AND NOT operator will be used in fact.
Composed resource
A ComposedResource defines a simple aggregate of resources and allows to regroup them within the same unit. Since a multimedia document is a resource, the simplest ComposedResource will be a corpus of documents such as the video about the same program during one year. It could also be a set of useful resources needed by a service such as a set of annotations or a document with a attached PoK that allows to analyse it. As a resource, a ComposedResource could be annotated to provide, for example, meta-information on its content or the reasons of the aggegate.
Coordinate
A coordinate is a simple container of two dimensional coordinate aiming at localising information spatially in a mediaUnit; for instance in an image or a video. Those dimensions are generally explained in pixel, given the fact that it starts at bottom-left with (0;0). Other measure somehow references are possible.
Document
A document is assumed to be a composed unit which handle the references of all the unit which have been build on it through the multiple processes. As a resource, a document could be annotated to provide, for example, meta-information on the original document source, the author or the original creation date.
Elementary Query
This kind of query is simply not a ComposedQuery. It contains a weight (with default value at 1.0) which could be used for Query combination.
Image
An image unit describe a visual static content out of media document. It does not have any particular attribute but only allow describing the structure. As a resource it can be annotated to describe the content. It can also be described using low level descriptors. The original content may be in the content field or a reference using annotation should be made to the content.
Linear segment
A linear segment is a position which can be described by a start and stop reference in accordance to a number of UTF-8 characters metric. It is the kind of segment that should be used for text units. As a resource, linear segments could be annotated to provide. This should be done to provide information on a particular part a text, like a word for instance.
Low Level Descriptor
A low level descriptor is composed of a setfeatures that have been extracted from a document or a part of document. It aims at representing low level annotation (not at a semantic level but at a numerical level) mainly for computing similarity between objects For instance, Text could use lowLevelDescriuptor to store TFIDF values, Image could use lowLevelDescriuptor to handle color histograms.A low level descriptor may be composed of a set of features for instance, an image may contains edge feature Vector as well as red color histogram vector. As a resource, a low level descriptor could be annotated to provide, for example, meta information on its creation date, its version or its application domain.
Media Unit
This is the major object manipulated through the WebLab platform. It is mainly assumed that almost all processing services should accept the media unit as a common argument and provide enhanced media unit as a result. A media unit can be defined as the structural annotable representation of any multimedia content. It is a resource and thus can be retrieved by an URI and annotated by any kind of descriptive annotations or low level descriptors. As described in the following sections any particular type of media (i.e. picture, text, video segment, audio sample or video frame...) will inherit from this object. It could have a composed unit as a parent when it is contained in a group of units. Finally it could contain annotable segments which will allow describing sub-parts of its own content.
Piece of Knowledge
A PieceOfKnowledge (or PoK) object should be understood as the definition provided by the W3C in its resource description framework. One can note that we involve the RDF methodology concepts and design formalism which should not be misunderstood as the RDF/XML serialisation format. Each PoK is composed of a set of RDF statements composed of a set of triple: subject, property and object. Thus any description can be applied on
any resource as soon as the property and object element refer to a consistent vocabulary in a certain domain. This vocabulary could be expressed in accordance to a specified ontology. However, one of the project's guidelines is extensibility, thus PieceOfKnowledge should be extendable using any OWLS or RDFS. The set of triple statements described a resource will be contained in the PieceOfKnowledge object serialised in the RDF/XML format. Since an PoK is a resource, it can also contain Annotations. The contained statements can be seen as meta-Annotations describing, for example, how and when the first level of annotations has been created (which service with what resource or configuration).
Query
A query is a resource which contains request data. This data describe a each specific specialisation of query, in a specific format. The query object is then abstract and several specialisations will be used to describe any type of queries. A proposal is to adopt common standards in order to provide consistent definitions over all the WebLab platform. XQuery and SPARQL format has been identified as a promising candidate respectively for structured and semantic search.As a resource, a query could be annotated to provide, for example, meta-informations its creation date, its author, etc.
Resource
A resource refers to any object that could be manipulated in the WebLab platform. It will be identified by a unique URI. It can hold some annotations that will describe the resource itself at a semantic level. It can also hold some low level descriptors that are describing itself at a lower level. It will be a common interface which will be inherited by almost all WebLab objects. Any reference to a resource will use its URI.
Result Set
A ResultSet is specific resource to described result of a Query. The results should be described semantically in the PoK linked to the ResultSet. See the WebLab ontology for the property on ResultSet. Additional and specific information could be added for results presentation in the Resources list.As a Resource, a ResultSet could be annotated to provide more information. But any information about the results by themselves and the query shall be in pok field.
Segment
A segment is a resource that should not have any content and which is linked to a media unit. It allows describing the content of a unit with at much finer level. The segment could be annotated as it inherits from resource. It provides a way to assign annotation on a very high level of structure description without adding weight to the model by transporting the data. The object willcontain positioning information which allows localising itself in the parent unit. As media type are very different the position itself will be specialised to them andthus provide localisation adapted to the media. This object cannot be used itself (this is an abstract object). However, some implementations with real capabilities must be developed in order to match every media class. A class of media stands here for a list of segments which can be localised in the same manner. For example, a text section can be described in the same way as a video segment: both of them need a start and stop index, one referring to character index and the other to a temporal reference.
Similarity Query
This query is dedicated for search by similarity and thus its content is one or more resources.
Spatial segment
A spatial segment is aiming to localise any meaningful content in a spatial document. For example, one can think to a picture showing some people. Specific segment can be localised with coordinate descriptors defining the silhouettes of each person in the picture. Then specific annotation can be applied to each segment (i.e. to declare that those are human beings). It is the kind of segment that may be used for image and video unit. When there are only two coordinates given associated to the spatialSegment, it means that the shape is a disk. The first coordinate is the centre and the second one in one point of the circle. Otherwise, coordinates are describing a closed shape since the last coordinate of the list will be linked to the first one.
String Query
This query is dedicated for any query expression language which can be expressed in a simple string such as full text queries, XQuery or SPARQL. Details on the language used to express the query should be provided in an Annotation on the query.
Temporal segment
A temporal segment is a segment that is described by a start and stop reference in accordance to a millisecond metric. It is the kind of position that may be used for audio and video units.
Text
A text unit is the simplest specification of the media unit dedicated to full text data. Its unique attribute is a string which is actually the text extracted from the original document content. This content is optional, since sometimes it's too large to be handled in this field. In that case, we encourage to create a content (in the content package) and to annotate the text with the identifier (URI) of the created content. A simple text document such as HTML page could be described by a document which contains a unique text unit. As a resource, a text unit could be annotated and could also be described with low level descriptors.
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