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.


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 record 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.


Content Model

<!ELEMENT  kwd-group    %kwd-group-model;                            >

Expanded Content Model

(title?, (kwd | compound-kwd | nested-kwd)+)


The following, in order:

This element may be contained in:

Example 1

An author’s list of keywords for a document:
<article dtd-version="1.1">
<kwd-group kwd-group-type="author">
<kwd>DNA analysis</kwd>
<kwd>gene expression</kwd>
<kwd>parallel cloning</kwd>
<kwd>fluid microarray</kwd>

Example 2

Keyword group with compound keywords:
<compound-kwd-part content-type="code">B01D57/02</compound-kwd-part>
<compound-kwd-part content-type="value">By electrophoresis</compound-kwd-part>

Example 3

Multiple keyword groups for a document (including Japanese):
<kwd-group xml:lang="en">
<kwd>heated air</kwd>

<kwd-group xml:lang="ja">