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.


id Identifier
kwd-group-type Keyword Authority
specific-use Specific Use
xml:lang Language

Content Model

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

Expanded Content Model

(label?, title?, ((kwd | compound-kwd | nested-kwd | x)+ | unstructured-kwd-group))


The following, in order:

This element may be contained in:

<article-meta>, <front-stub>, <sec-meta>


<kwd-group kwd-group-type="author">
<kwd>DNA analysis</kwd>
<kwd>gene expression</kwd>
<kwd>parallel cloning</kwd>
<kwd>fluid microarray</kwd>