<xref>

X(cross) Reference

Definition

Used for any kind of internal referencing

Remarks

This element may be used to reference anything that has an id attribute (an attribute of type id). This single element takes the place of the many named types of references (such as figure references, table references, and footnote references) that are common in many Tag Sets.

Unlike the base Suite, the NCBI Book Tag Set’s and the NCBI Collection Tag Set’s content model for this element includes graphical elements for use in instances where, for example, an onscreen arrow serves as the link to a picture or database.

The ref-type attribute (of the <xref> element) can be used to preserve information concerning what type of element is being pointed to by the cross-reference.

Display/Formatting Note: The content of the reference (if present) will be displayed as the link.

Attributes

id Identifier
ref-type Type of Cross Reference
rid Reference to an Identifier

Model Information

Content Model

<!ELEMENT  xref         (#PCDATA %xref-elements;)*                   >

Description

Any combination of:

This element may be contained in:

<aff> Affiliation; <alt-title> Alternate Title; <article-title> Article Title; <attrib> Attribution; <bold> Bold; <book-title> Book Title; <chem-struct> Chemical Structure (Display); <collab> Collaborative (Group) Author; <collection-name> Collection Name; <comment> Comment in a Citation; <contrib> Contributor; <contrib-group> Contributor Group; <def-head> Definition List: Definition Head; <italic> Italic; <kwd> Keyword; <meta-name> Metadata Data Name for Custom Metadata; <meta-value> Metadata Data Value for Custom Metadata; <monospace> Monospace Text (Typewriter Text); <multi-link> Multi-Link; <named-content> Named Special (Subject) Content; <overline> Overline; <p> Paragraph; <sans-serif> Sans Serif; <sc> Small Caps; <speaker> Speaker; <strike> Strike Through; <sub> Subscript; <subtitle> Subtitle; <sup> Superscript; <td> Table Data Cell (XHTML table model); <term> Definition List: Term; <term-head> Definition List: Term Head; <th> Table Header Cell (XHTML table model); <title> Title; <trans-subtitle> Translated Subtitle; <trans-title> Translated Title; <underline> Underline

Tagged Example


...
<sec id="bid.36">
<title>Microbial Genomes</title>
<p>... A CON entry, containing instructions on how to 
put the pieces back together, is also made. The CON entry 
contains descriptor information, such as source organism 
and references, as well as a join statement providing 
explicit instructions on how to generate the complete 
genome from the pieces. The Accession number assigned to 
the CON record is also added as a secondary Accession 
number on each of the pieces that make up the complete 
genome (see <xref ref-type="fig" rid="bid.37">Figure 2</xref>).
<fig id="bid.37">
<label>2</label>
<caption><title>A GenBank CON entry for a complete 
bacterial genome.</title>
<p>The information toward the <italic>bottom</italic> of 
the record describes how to generate the complete genome 
from the pieces.</p>
</caption>
<graphic xmlns:xlink="http://www.w3.org/1999/xlink" 
xlink:href="ch1f2" mime-subtype="gif"/>
</fig>
</p>
...
</sec>
...

Module

link.ent