xces:ptrType 

A pointer to another location in the current document in
terms of one or more identifiable elements.

Complex Type Information

Model

Attributes

QName Type Fixed Default Use Inheritable Annotation
TEIform xs:string optional
corresp xs:IDREFS optional
crdate xs:string optional
evaluate restriction of xs:NMTOKEN optional
id xs:ID optional
lang xs:IDREF optional
n xs:string optional
next xs:IDREF optional
prev xs:IDREF optional
rend xs:string optional
resp xs:string optional
targOrder restriction of xs:NMTOKEN u optional
targType xs:NMTOKENS optional
target xs:IDREFS required
type xs:string optional
wsd xs:string optional
xml:lang union of(xs:language, restriction of xs:string) optional 
Attempting to install the relevant ISO 2- and 3-letter
         codes as the enumerated possible values is probably never
         going to be a realistic possibility.  See
         RFC 3066 at http://www.ietf.org/rfc/rfc3066.txt and the IANA registry
         at http://www.iana.org/assignments/lang-tag-apps.htm for
         further information.

         The union allows for the 'un-declaration' of xml:lang with
         the empty string.

Source 

<xs:complexType name="ptrType">
  <xs:annotation>
    <xs:documentation xml:lang="en">A pointer to another location in the current document in terms of one or more identifiable elements.</xs:documentation>
  </xs:annotation>
  <xs:complexContent>
    <xs:extension base="xces:class.text.elementOnly">
      <xs:attribute name="corresp" type="xs:IDREFS"/>
      <xs:attribute name="next" type="xs:IDREF"/>
      <xs:attribute name="prev" type="xs:IDREF"/>
      <xs:attribute name="type" type="xs:string"/>
      <xs:attribute name="resp" type="xs:string"/>
      <xs:attribute name="crdate" type="xs:string"/>
      <xs:attribute name="targType" type="xs:NMTOKENS"/>
      <xs:attribute name="targOrder" default="u">
        <xs:simpleType>
          <xs:restriction base="xs:NMTOKEN">
            <xs:enumeration value="y"/>
            <xs:enumeration value="n"/>
            <xs:enumeration value="u"/>
          </xs:restriction>
        </xs:simpleType>
      </xs:attribute>
      <xs:attribute name="evaluate">
        <xs:simpleType>
          <xs:restriction base="xs:NMTOKEN">
            <xs:enumeration value="all"/>
            <xs:enumeration value="one"/>
            <xs:enumeration value="none"/>
          </xs:restriction>
        </xs:simpleType>
      </xs:attribute>
      <xs:attribute name="target" type="xs:IDREFS" use="required"/>
    </xs:extension>
  </xs:complexContent>
</xs:complexType>