<relatedItem>

<relatedItem> contains or references some other bibliographic item which is related to the present one in some specified manner, for example as a constituent or alternative version of it.
Module core — 3 Elements Available in All TEI Documents
In addition to global attributes att.typed (@type, @subtype)
target points to the related bibliographic element by means of an absolute or relative URI reference
Status Optional
Datatype 

<rng:ref name="data.pointer"/>
data.pointer
Used by
biblStruct model.biblPart
May contain
core: bibl biblStruct ptr ref
header: biblFull
msdescription: msDesc
Declaration 

<rng:element name="relatedItem">
 <rng:ref name="att.global.attributes"/>
 <rng:ref name="att.typed.attributes"/>
 <rng:optional>
  <rng:attribute name="target">
   <rng:ref name="data.pointer"/>
  </rng:attribute>
 </rng:optional>
 <rng:choice>
  <rng:ref name="model.biblLike"/>
  <rng:ref name="model.ptrLike"/>
 </rng:choice>
</rng:element>
element relatedItem
{
   att.global.attributes,
   att.typed.attributes,
   attribute target { data.pointer }?,
   ( model.biblLike | model.ptrLike )
}
Example
<biblStruct>
 <monogr>
  <author>Shirley, James</author>
  <title type="main">The gentlemen of Venice</title>
  <imprint>
   <pubPlace>New York</pubPlace>
   <publisher>Readex Microprint</publisher>
   <date>1953</date>
  </imprint>
  <extent>1 microprint card, 23 x 15 cm.</extent>
 </monogr>
 <series>
  <title>Three centuries of drama: English, 1642–1700</title>
 </series>
 <relatedItem type="original">
  <biblStruct>
   <monogr>
    <author>Shirley, James</author>
    <title type="main">The gentlemen of Venice</title>
    <title type="subordinate">a tragi-comedie presented at the private house in Salisbury
         Court by Her Majesties servants</title>
    <imprint>
     <pubPlace>London</pubPlace>
     <publisher>H. Moseley</publisher>
     <date>1655</date>
    </imprint>
    <extent>78 p.</extent>
   </monogr>
  </biblStruct>
 </relatedItem>
</biblStruct>