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6. Managing Individual Concepts - conceptItem
An XML Schema file corresponding to the specifications for this item is available (see The Full Set of Specification Documents.
6.1. Description
A conceptItem aims to convey knowledge about a single concept, a named entity such as an organisation or an abstract notion such as a news subject (see Representing Concept Information concept Component). Typically a conceptItem holds only a rather limited set of metadata about the concept and the structured concept data as content of the item.
Typical characteristics of a conceptItem are:
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It focuses on a single concept or entity.
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It will usually be updated infrequently but over a long period of time, when the information about the concept evolves.
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Its content is of long term interest.
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It may be referenced by other items.
Different Concept Items, managed by different providers, may contain structured information about the same concept.
6.2. Structure of a Concept Item
The model of a conceptItem is very similar to the model of a newsItem. Both share the same indicators of compliance with a standard and conformance level, Identification and versioning, Signature, Rights Information, Item Metadata, Item links. Please review the corresponding specification of a newsItem for more information.
6.2.1. Note about the different identifiers for a concept and a conceptItem
Each concept has its globally unique concept identifier, a conceptId which is part of the concept structure and defined by the authority of the scheme.
Additionally, a conceptItem has its globally unique identifier (guid) attribute which is assigned by a system managing G2 items.
Be aware that these two identifiers must not be mixed up, all references to a concept MUST use the concept identifier and not the guid of the conceptItem.
6.2.2. Item Class
The IPTC provides a mandatory standardised scheme applicable to the itemClass property, identified by the URI: http://cv.iptc.org/newscodes/cinature/.
6.2.3. Concept related Metadata
The set of administrative metadata is common to all classes of Items.
The set of descriptive metadata for a Concept Item is listed below. All properties are optional, repeatable and may be inserted in any order.
Table 8. Descriptive Metadata Core Group Elements
| Element Title | Element Name | Card |
|---|---|---|
Language |
(0..unbounded) |
|
Keyword |
(0..unbounded) |
|
Subject |
(0..unbounded) |
|
Slugline |
(0..unbounded) |
|
Headline |
(0..unbounded) |
|
Description |
(0..unbounded) |
Each provider may add a set of metadata properties which have to be defined in a non-IPTC-G2 namespace. See also XML Namespaces and Extension Points in XML.
Please review News Content Metadata of the News Item chapter for more information.
6.2.4. Metadata Helpers
The conceptItem includes three properties which are available to help make metadata assertions:
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the assert property: helps to bundle and extend details of concepts, see Assertions About Concepts
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the inlineRef property: helps to reference concepts which are inline, within free text properties of type label, see References to Inline Concepts
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the derivedFrom property: helps to document from which concept a concept, used as property value in this item, has been derived, see Document Derivation of Concepts
6.3. conceptItem Content
The content of a conceptItem is a concept component (see Concept Component).