<nested-kwd>
Nested Keyword
A hierarchically-structured keyword, such as a keywords from a controlled vocabulary.
Remarks
Key words 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. None of the individual keyword elements (<kwd>, <compound-kwd>, <nested-kwd>) 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 <kwd> 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 identify that source. The source named can be a formal ontology or an informal field of study.
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 attribute value is “digitized-vor”, the element might contain the display text “Digitized Version of Record”. |
|---|---|
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 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”. |
|---|---|
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 nested-kwd %nested-kwd-model; >
Expanded Content Model
((kwd | compound-kwd)+, nested-kwd*)
Description
The following, in order:
- One or more of any of:
- <nested-kwd> Nested Keyword, zero or more
This element may be contained in:
Example 1
A 3-level nested keyword 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>
...Example 2
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>
...Example 3
A hierarchy of heart diseases:
...
<article-meta>
...
<abstract>...</abstract>
<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>
</article-meta>
...Example 4
Nested keyword in section metadata to provide navigation information for an app:
... <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> ...