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   <volume>97</volume>
   <issue>4</issue>
   <fpage>1665</fpage>
   <lpage>1670</lpage>
   <history>...</history>
   <permissions>
    <copyright-statement>Copyright © 2000, The National Academy of
     Sciences</copyright-statement>
    <copyright-year>2000</copyright-year>
   </permissions>
   <abstract>
    <p>We describe a method for cloning nucleic acid molecules
     onto the surfaces of 5-μm microbeads rather than in biological hosts. A
     unique tag sequence is attached to each molecule, and the tagged library is
     amplified. Unique tagging of the molecules is achieved by sampling a small
     fraction (1%) of a very large repertoire of tag sequences. The resulting
     library is hybridized to microbeads that each carry ≈10<sup>6</sup>
     strands complementary to one of the tags. About 10<sup>5</sup> copies of each
     molecule are collected on each microbead. Because such clones are segregated on
     microbeads, they can be operated on simultaneously and then assayed separately.
     To demonstrate the utility of this approach, we show how to label and extract
     microbeads bearing clones differentially expressed between two libraries by
     using a fluorescence-activated cell sorter (FACS). Because no prior information
     about the cloned molecules is required, this process is obviously useful where
     sequence databases are incomplete or nonexistent. More importantly, the process
     also permits the isolation of clones that are expressed only in given tissues or
     that are differentially expressed between normal and diseased states. Such
     clones then may be spotted on much more cost-effective, tissue- or
     disease-directed, low-density planar microarrays.</p>
   </abstract>
   <kwd-group kwd-group-type="author">...</kwd-group>
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</article>

<article dtd-version="1.4">
 <front>
  <journal-meta>...</journal-meta>
  <article-meta>
   ...
   <permissions>
    <copyright-statement>Copyright © 1999, British
     Medical Journal</copyright-statement>
    <copyright-year>1999</copyright-year>
   </permissions>
   <abstract abstract-type="section">
    <sec>
     <title>Objective</title>
     <p>To examine the effectiveness of day hospital attendance
      in prolonging independent living for elderly people.</p>
    </sec>
    <sec>
     <title>Design</title>
     <p>Systematic review of 12 controlled clinical trials 
      (available by January 1997) comparing day hospital care with
      comprehensive care (five trials), domiciliary care (four trials),
      or no comprehensive care (three trials).</p>
    </sec>
    <sec>
     <title>Subjects</title>
     <p>2867 elderly people.</p>
    </sec>
    <sec>
     <title>Main outcome measures</title>
     <p>Death, institutionalisation, disability, global “poor
      outcome,” and use of resources.</p>
    </sec>
    <sec>
     <title>Results</title>
     <p>Overall, there was no significant difference between day 
      hospitals and alternative services for death, disability, or 
      use of resources. However, ...</p>
    </sec>
    <sec>
     <title>Conclusions</title>
     <p>Day hospital care seems to be an effective service for 
      elderly people ...</p>
     <p><boxed-text position="float">
      <sec><title>Key messages</title>
       <p>...</p>
      </sec>
     </boxed-text></p>
    </sec>
   </abstract>
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 </front>
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</article>

...
<article-meta>
 ...  
 <abstract>
  <p>This is the third and last part of the volume devoted to solubility data of rare 
   earth metal chlorides in water and in ternary and quaternary aqueous systems. 
   Compilations of all available experimental data for each rare earth metal chloride 
   are introduced with a corresponding critical evaluation. Every such evaluation 
   contains a tabulated collection of all solubility results in water, a scheme of the 
   water-rich part of the equilibrium ... Because the ternary and quaternary systems 
   were almost never studied more than once, no critical evaluations or systematic 
   comparisons of such data were possible. Simple chlorides (no complexes) of 
   Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu are treated as the input substances. The 
   literature (including a thorough coverage of papers in Chinese and Russian) 
   has been covered through the middle of 2008.</p>
 </abstract>
 <abstract abstract-type="short">
  <p>The is the third and last part of the volume devoted to solubility data of rare 
   earth metal chlorides in water and in ternary and quaternary aqueous systems. 
   Compilations of all available experimental data are introduced for each rare earth 
   metal chloride with a corresponding critical evaluation. This part covers chlorides 
   of Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu, with coverage of the literature through the 
   middle of 2008.</p>
 </abstract>
</article-meta>
...

<article-meta>
 ...
 <abstract xml:lang="es" 
    lang-variant="original" lang-source="author">
  <title>RESUMEN</title>
  <p>La repetición verbal espontánea forma parte de la
   interacción temprana adulto–niño, estando enmarcadas 
   en el seno de conversaciones. ...</p>
 </abstract>

 <abstract xml:lang ="en" 
    lang-variant="translation" lang-source="translator">
  <title>ABSTRACT</title>
  <p>Spontaneous verbal repetition is part of early adult–child 
   conversational interchanges. ...</p>
 </abstract>
 ...
</article-meta>