Simple pointers and links: within a document by Id attribute

• <ptr> a pointer to another location in the current document in terms of one or more identifiable elements.

• <ref> a reference to another location in the current document, in terms of one or more identifiable elements, possibly modified by additional text or comment.

• <link> defines an association or hypertextual link among elements or passages, of some type not more precisely specifiable by other elements (also possible between different documents)
  • Example: <note id="n3.284" type="imitation" place="foot" anchored="no"> <ref id="r3.284" rend="sc">...</ref> </note> <link targType="ref l" targOrder="Y" targets="r3.284 l3.284"/>

• <linkGrp> Link groups
  • Example: <linkGrp type="imitation" targType="note l" targOrder="Y"> <link targets="n2.79 l2.79"/> <link targets="n2.88 l2.88"/> <!-- ... --> <link targets="n3.284 l3.284"/> <!-- ... --> </linkGrp>

• <anchor> specifies a location or point within a document so that it may be pointed to.
• <seg> identifies a span or segment of text within a document so that it may be pointed to.

Extended pointers: Between documents and by XPointer

• <xptr> defines a pointer to another location in the current document or an external document.
  • Examples:
    • <p>This is discussed in <xptr doc="TEIP3"/>.</p>
    • <xptr doc="OrbisPictus?" from="id (animalia)"/>
    • <xptr doc="OrbisPictus?" from="id (animalia)" to="id (aquaticae)"/>
    • <xptr doc="P3" from="id (SA) child (3 p)"/> (the third <p> element directly contained by whatever element has the identifier SA)
    • <p>This is discussed in <xptr url="​http://www.tei-c.org/TEI/Guidelines/SA.html"/>

• <xref> defines a pointer to another location in the current document or an external document, possibly modified by additional text or comment.
  • Examples:
    • <p>This is discussed in <xref doc="TEIP3">The TEI Guidelines</xref>.</p>
    • <p>This is discussed in <xref url="​http://www.tei-c.org/TEI/Guidelines/SA.html">the chapter on linking</xref> --> HTML: <p>This is discussed in <a href="​http://www.tei-c.org/TEI/Guidelines/SA.html">the chapter on linking</a>
    • <p>This is discussed in <xref doc="TEIP3SA" from="id(SAXR)">the chapter on linking</xref>.</p> --> HTML: <p>This is discussed in <a href="​http://www.tei-c.org/TEI/Guidelines/SA.html#SAXR">the subsection on external linking</a>

• XPointers in a URL:
  • example.xml#xpointer((p)[1])
  • example.xml#xpointer(id('4711')/div[1])

• XPoints

• Examples
  • point(1.0) is just inside the beginning of the p element.
  • point(1.2) is between the end of the em element and the following text node (which contains "world.").
  • point(.0) immediately precedes the root node.
  • point(1/2/1.1) immediately following the "b" in the middle text node.