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<tbx:xSource> External Source (TBX)

The <tbx:xSource> element is a hyperlinking element that points,through the @xtarget attribute, to an external source of information.

Usage/Remarks

Content/Display

Typically, this element will be rendered in the published text with the label “See:” before it. The element content should contain the desired display text of the link: 
<tbx:xSource xtarget="http://www.example.com/source/dictionary.html">Dictionary definition</tbx:xSource>

Linking

The required @xtarget attribute will hold the URI for the actual link.
Attributes
xtarget (REQUIRED)

Base Attributes

id
xml:base
Models and Context
May be contained in
<tbx:langSet>, <tbx:termEntry>
Description
Text, numbers, or special characters
Content Model
<!ELEMENT  %TBX.xSource; 
                        (#PCDATA)                                    >
Tagged Sample

<tbx:xSource> provides a link to the <tbx:source> 

<tbx:termEntry id="ISO10241-1.a210.14">
  <tbx:langSet xml:lang="en">
    <tbx:definition>any event or series of events that disrupt ecosystem, community, or population
      structure and alters the physical environment</tbx:definition>
    <tbx:source>U.S. ENVIRONMENTAL PROTECTION AGENCY. <italic>Terms of Environment: Glossary,
      Abbreviations and Acronyms</italic> online, viewed 2010-07-29].</tbx:source>
    <tbx:xSource xtarget="http://www.epa.gov/OCEPAterms/dterms.html">Available from:
      http://www.epa.gov/OCEPAterms/dterms.html.</tbx:xSource>
    <tbx:tig>
      <tbx:term id="a210.14-1">disturbance</tbx:term>
      <tbx:partOfSpeech value="noun"/>
      <tbx:pronunciation>/dıˈstɜ:bəns/</tbx:pronunciation>
    </tbx:tig>
  </tbx:langSet>
</tbx:termEntry>