== 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.
(auch zwischen verschiedenen Dokumenten möglich)
Beispiel:
<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> Linkgruppen
Beispiel:
<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)
HTML:
<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>
HTML:
<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>

In a URL:

example.xml#xpointer((//p)[1])
example.xml#xpointer(id('4711')/div[1])