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<nested-kwd> Nested Keyword
A hierarchically-structured keyword, such as a keywords from a controlled vocabulary.
Usage/Remarks
Nested keywords are contained in <kwd-group>s. There may be several <kwd-group>s, each of which can be identified separately by language, vocabulary, or taxonomy
source.
The <nested-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.
Attribute Best Practice
If the content of the <nested-kwd> element is a term from a controlled vocabulary (ontology, taxonomy, term-list, vocabulary,
industry glossary, or other known source), the vocabulary identification attributes
should be used to identify that source. The vocabulary term identification attributes
may also be used to specify the term within the taxonomy, ontology, etc.
Vocabulary Identification Attributes
Two attributes are used in this Tag Set to identify a vocabulary. If these attributes
have already been used on <kwd-group>, they need not be repeated on each <kwd>.
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”.
|
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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/”.
|
Vocabulary Term Identification Attributes
Two attributes are used in this Tag Set to identify an individual term from a vocabulary (controlled or an uncontrolled):
vocab-term
|
The content of the element is the display version of the vocabulary or taxonomic term.
The
@vocab-term attribute holds the canonical version of the same term, as it appears in the vocabulary.
For example, if the element display text content is “Digitized Version of Record” the attribute value might be “digitized-vor”.
|
---|---|
vocab-term-identifier
|
Unique identifier of the term within a specific vocabulary, such as (but not limited to) an item number, a URI,
DOI, etc.
|
Vocabulary Term Identification Attributes
Two attributes are used in this Tag Set to identify an individual term from a vocabulary (controlled or uncontrolled):
vocab-term
|
The content of the element is the display version of the vocabulary or taxonomic term.
The
@vocab-term attribute holds the canonical version of the same term,
as it appears in the vocabulary. For example, if the element display text content
is
“Digitized Version of Record”, the attribute value might be “digitized-vor”.
|
---|---|
vocab-term-identifier
|
Unique identifier of the term within a specific vocabulary, such as (but not limited to) an item number, a URI,
DOI, etc.
|
Attributes
Models and Context
May be contained in
Description
The following, in order:
- One or more of any of:
- <nested-kwd> Nested Keyword, zero or more
Content Model
<!ELEMENT nested-kwd %nested-kwd-model; >
Expanded Content Model
((kwd | compound-kwd)+, nested-kwd*)
Tagged Samples
3-level nested list
...
<kwd-group kwd-group-type="xyw-food-taxonomy">
<nested-kwd>
<kwd>drink</kwd>
<nested-kwd>
<kwd>alcoholic</kwd>
<nested-kwd>
<kwd>beer</kwd>
<kwd>martini</kwd>
<kwd>wine</kwd>
</nested-kwd>
</nested-kwd>
<nested-kwd>
<kwd>dairy</kwd>
<nested-kwd>
<kwd>milk</kwd>
<kwd>drinkable yogurt</kwd>
<kwd>milkshakes</kwd>
</nested-kwd>
</nested-kwd>
</nested-kwd>
</kwd-group>
...
Nested compound keywords
...
<kwd-group kwd-group-type="ISO-party-codes">
<nested-kwd>
<compound-kwd content-type="ISO-party-codes">
<compound-kwd-part content-type="ISO-party-code-value">4335</compound-kwd-part>
<compound-kwd-part content-type="ISO-party-code-name">Halloween</compound-kwd-part>
</compound-kwd>
<nested-kwd>
<compound-kwd>
<compound-kwd-part content-type="ISO-party-code-value">43351</compound-kwd-part>
<compound-kwd-part content-type="ISO-party-code-name">Adult Halloween
Party</compound-kwd-part>
</compound-kwd>
<compound-kwd>
<compound-kwd-part content-type="ISO-party-code-value">43352</compound-kwd-part>
<compound-kwd-part content-type="ISO-party-code-name">Children's Halloween
Party</compound-kwd-part>
</compound-kwd>
</nested-kwd>
</nested-kwd>
</kwd-group>
...
Hierarchy of heart diseases
...
<kwd-group kwd-group-type="author">
<nested-kwd>
<kwd>Other rheumatic heart disease</kwd>
<nested-kwd>
<kwd>Rhematic myocarditis</kwd>
<kwd>Other and unspecified rheumatic heart disease</kwd>
<nested-kwd>
<kwd>Rheumatic heart disease, unspecified</kwd>
<kwd>Rheumatic heart failure (congestive)</kwd>
<kwd>Other</kwd>
</nested-kwd>
</nested-kwd>
</nested-kwd>
</kwd-group>
...
In section metadata
... <sec> <sec-meta> <kwd-group specific-use="mobile-nav"> <nested-kwd> <kwd>dosing</kwd> <nested-kwd> <kwd>geriatric</kwd> <nested-kwd> <kwd>Digoxin</kwd> </nested-kwd> </nested-kwd> </nested-kwd> </kwd-group> <kwd-group specific-use="mobile-nav"> <nested-kwd> <kwd>Digoxin</kwd> <nested-kwd> <kwd>dosing</kwd> <nested-kwd> <kwd>geriatric</kwd> </nested-kwd> </nested-kwd> </nested-kwd> </kwd-group> </sec-meta> <title>Dosing Table, Geriatric</title> ... </sec> ...
Related Resource
- For a discussion on the use of <nested-kwd>, see: Keywords.
- See: Hierarchy diagram - Keyword Group