<kwd-group>
Keyword Group
Container element for one set of keywords (such as <kwd>s, <nested-kwd>s, or <compound-kwd>s) used to describe a document.
Remarks
Related Essay: For a discussion on the use of <kwd-group>, see Keywords.
Usage: A document may take multiple sets of keywords, with the @kwd-group-type, @specific-use, or @xml:lang attributes used to discriminate between them. The <kwd> element does not take the @xml:lang attribute; that is reserved for the <kwd-group>. This means that keywords must be sorted by language and entered in language groups.
The @kwd-group-type attribute most commonly names the source of the keywords, such as
“mesh”,
“ISO-463”, or
“author-generated”. But it is also appropriate to use @kwd-group-type to identify the type of keywords, for example,
“hierarchical” for keywords that are grouped into a hierarchy,
“abbreviations” for keywords that contain an abbreviation and its expansion, or
“code” for keywords that contain a code and its text but where the source of the codes is unknown.
Attribute Best Practice: If the content of the <kwd-group> element is a term from a controlled vocabulary (ontology, taxonomy, term-list, vocabulary, industry glossary, or other known source), the vocabulary attributes should be used to record that source. The source named can be a formal ontology or an informal field of study. Two attributes are used in this Tag Set to identify such a controlled or uncontrolled vocabulary:
vocab | Name of the controlled or uncontrolled vocabulary, taxonomy, ontology, index, database, or similar that is the source of the term. For example, for a subject term, a value might be the IPC Codes (“ipc”) or MESH headings
(“mesh”). For an uncontrolled term, the value might be
an area of study such as “medical-devices” or merely the word “uncontrolled”. |
|---|---|
vocab-identifier | Unique identifier of the vocabulary, such as (but not limited to) a URI or DOI. For example, for Dublin Core (DCC), the identifier may be “http://dublincore.org/documents/2012/06/14/dces/”. |
Attributes
Content Model
<!ELEMENT kwd-group %kwd-group-model; >
Expanded Content Model
(title?, (kwd | compound-kwd | nested-kwd)+)
This element may be contained in:
Example 1
An author’s list of keywords for a document:
<article dtd-version="1.2">
<front>
<article-meta>
...
<abstract>...</abstract>
<kwd-group kwd-group-type="author">
<kwd>DNA analysis</kwd>
<kwd>gene expression</kwd>
<kwd>parallel cloning</kwd>
<kwd>fluid microarray</kwd>
</kwd-group>
</article-meta>
</front>
...
</article>
Example 2
Keyword group with compound keywords:
...
<kwd-group>
<compound-kwd>
<compound-kwd-part content-type="code">B01D57/02</compound-kwd-part>
<compound-kwd-part content-type="value">By electrophoresis</compound-kwd-part>
</compound-kwd>
...
</kwd-group>
...Example 3
Multiple keyword groups for a document (including Japanese):
... <article-meta> ... <kwd-group xml:lang="en"> <kwd>heated air</kwd> </kwd-group> <kwd-group xml:lang="ja"> <kwd>加温空気</kwd> </kwd-group> ... </article-meta> ...
Example 4
Two vocabularies in one keyword group:
...
<kwd-group kwd-group-type="library-classifications">
<compound-kwd vocab="LOC"
vocab-term="Diseases of the respiratory system"
vocab-term-identifier="RC705-779">
<compound-kwd-part>RC705-779</compound-kwd-part>
<compound-kwd-part>Diseases of the respiratory system</compound-kwd-part>
</compound-kwd>
<compound-kwd vocab="Dewey Decimal"
vocab-term="Diseases of the respiratory system"
vocab-term-identifier="616.3">
<compound-kwd-part>616.3</compound-kwd-part>
<compound-kwd-part>Diseases of the respiratory system</compound-kwd-part>
</compound-kwd>
</kwd-group>
...Example 5
An ICD10 vocabulary:
...
<kwd-group kwd-group-type="conditions">
<compound-kwd vocab="ICD10" vocab-term="J00-J99">
<compound-kwd-part>J00-J99</compound-kwd-part>
<compound-kwd-part>Diseases of the respiratory system</compound-kwd-part>
</compound-kwd>
</kwd-group>
...
Example 6
Generic subject within Dublin Core subjects:
...
<kwd-group vocab="dublincore" kwd-group-type="subject">
<nested-kwd vocab="scientific name">
<kwd vocab="scientific name" vocab-term="kingdom">Plantae</kwd>
<kwd vocab="scientific name" vocab-term="phylum">Anthophyta</kwd>
<kwd vocab="scientific name" vocab-term="class">Monocoty</kwd>
<kwd vocab="scientific name" vocab-term="order">Commelinales</kwd>
<kwd vocab="scientific name" vocab-term="family">Poaceae</kwd>
<kwd vocab="scientific name" vocab-term="genus">Zea</kwd>
<kwd vocab="scientific name" vocab-term="species">Z. mays</kwd>
</nested-kwd>
</kwd-group>
...