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<sec> Section

Headed group of material; the basic structural unit of the body of a document.

Usage/Remarks

A very short article may contain nothing but paragraphs (and other paragraph-level elements such as figures and tables), but most journal articles are divided into sections, each with a title that describes the content of the section, such as “Introduction”, “Methodology”, or “Conclusions”.
Sections are recursive, that is, various levels of sections are indicated by containment, not by different names for the subsections. A <sec> element may contain lower-level sections that are also tagged using the <sec> element, not tagged explicitly as <sec2>, <sec3>, <subsec1>, etc.
Attributes
sec-type
specific-use
supplemental

Multi-lang Attributes

lang-focus
lang-focus-custom
lang-group
lang-source
lang-source-custom
lang-translate
lang-variant
lang-variant-custom

Base Attributes

id
xml:base
xml:lang
Models and Context
May be contained in
<abstract>, <answer>, <app>, <bio>, <body>, <boxed-text>, <explanation>, <option>, <question>, <question-preamble>, <sec>
Description
The following, in order:
Content Model
<!ELEMENT  sec          %sec-model;                                  >
Expanded Content Model

(title, (answer | answer-set | boxed-text | chem-struct-wrap | code | explanation | fig | graphic | media | preformat | question | question-wrap | question-wrap-group | supplementary-material | table-wrap | disp-formula | disp-formula-group | def-list | list | p | disp-quote | speech | statement | verse-group)*, (sec)*)

Tagged Samples
Nested sections in the <body> 
<article dtd-version="1.4d1">
 <front>...</front>
 <body>
  <sec sec-type="intro">
   <title>Introduction</title>
   <p>Geriatric day hospitals developed rapidly in the United Kingdom
    in the 1960s as an important component of care provision. The model
    has since been widely applied in several Western countries. Day
    hospitals provide multidisciplinary assessment and rehabilitation
    in an outpatient setting and have a pivotal position between hospital
    and home based services ... We therefore undertook a systematic
    review of the randomized trials of day hospital care.</p>
  </sec>
  <sec sec-type="methods">
   <title>Methods</title>
   <p>The primary question addressed was ...</p>
   <sec>
    <title>Inclusion criteria</title>
    <p>We set out to identify all ...</p>
   </sec>
   <sec>
    <title>Search strategy</title>
    <p>We searched for ...</p>
   </sec>
   ...
  </sec>
 </body>
 ...
</article>
Alternative Spanish and English Variants of a Section 
...
<sec id="s0005" xml:lang="en" lang-group="s0005"
  lang-variant="translation" lang-source="translator"
  lang-focus="secondary">
 <title>Method</title>
 ...
</sec>

<sec id="s0011">...</sec>

<sec id="s0013" xml:lang="es" lang-group="s0005"
  lang-variant="original" lang-source="author"
  lang-focus="primary">
 <title>Método</title>
 ...
</sec>
...
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