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<object-id> Object Identifier

Unique identifier (such as a DOI or URI) for a component within a book, a book component, or a structural portion of a book (for example, for a figure or a table).

Usage/Remarks

Such an identifier may be created by a publisher or archive, and there is no requirement that identifiers be unique.
Design Note
An element, rather than an attribute, was chosen as the means to capture DOIs and other identifiers so multiple identifiers could be retained.
Publication Identifier versus Object Identifier
This Tag Set includes two elements which may be used to record a DOI as an identifier: <object-id> and <pub-id>. The <object-id> is used to identify parts of a book or book component, for example, a particular section, a figure, a table, or even a specific citation (as an entity) in the bibliographic reference list of a book or book part. The <pub-id> element is used inside a citation to identify a cited publication. Consequently, a bibliographic reference (<element-citation> or <mixed-citation>) could contain both the <object-id> element (with the DOI for that citation) and the <pub-id> element (with the DOI for the journal being referenced in the citation) as shown in an example below.
External Identifier
This element holds an external identifier, typically assigned to an object such as a table by a publisher. The contents of this element should not be confused with the @id attribute, which holds an internal document identifier that can be used by software to preform a simple link.
Attributes
assigning-authority
content-type
pub-id-type
specific-use

Base Attributes

id
xml:base
Models and Context
May be contained in
<abstract>, <ack>, <alternatives>, <answer>, <answer-set>, <app>, <app-group>, <bio>, <boxed-text>, <chem-struct>, <chem-struct-wrap>, <citation-alternatives>, <disp-formula>, <disp-formula-group>, <element-citation>, <explanation>, <fig>, <fig-group>, <graphic>, <media>, <mixed-citation>, <notes>, <option>, <product>, <question>, <question-preamble>, <question-wrap>, <question-wrap-group>, <ref-list>, <related-article>, <related-object>, <sec>, <sec-meta>, <speech>, <statement>, <supplementary-material>, <table-wrap>, <table-wrap-group>, <trans-abstract>
Description
Text, numbers, or special characters
Content Model
<!ELEMENT  object-id    (#PCDATA)                                    >
Tagged Samples
Media object with DOI 
...
<media id="v1" mime-subtype="avi" mimetype="video" orientation="portrait" 
  position="anchor" specific-use="original-format" xlink:href="v1">
 <object-id pub-id-type="doi" specific-use="metadata">10.1063/1.4807071.1</object-id>
</media>
...
...
<fig id="f1" orientation="portrait" position="float">
 <label>FIG. 1.</label>
 <caption>
  <p>(a) Schematic of the working principles of HFM, (b) a typical application
   scheme for an electric bias in HFM, (c) regulation the conformations and
   dynamics (trapping, concentration, and sudden stretching) of λ-DNA molecules
   in HFM, and (d) schematic of the trapping location regulation (enhanced online).
   [URL: <ext-link ext-link-type="uri" xlink:href="http://dx.doi.org/10.1063/1.4762852.1">
   http://dx.doi.org/10.1063/1.4762852.1</ext-link>]
   <media id="v1" mime-subtype="avi" mimetype="video" orientation="portrait"
     position="anchor" specific-use="original-format" xlink:href="v1">
    <object-id pub-id-type="doi" specific-use="metadata">10.1063/1.4762852.1</object-id>
   </media>
  </p>
 </caption>
 <graphic xlink:href="f1"/>
 <graphic id="f1a"  xlink:href="dummy1.png"/>
 <graphic id="f1b"  xlink:href="dummy2.png"/>
 <graphic id="f1c"  xlink:href="dummy3.png"/>
 <graphic id="f1d"  xlink:href="dummy4.png"/>
</fig>
...
Citation with DOI 
...
<book-back>
 <ref-list>
  ...
  <ref id="B7">
   <label>7</label> 
   <element-citation> 
    <object-id pub-id-type="doi">
     MyPub.20070215.03154.s434</object-id> 
    <person-group person-group-type="author"> 
     <name><surname>Brook</surname> 
      <given-names>I.</given-names></name>
    </person-group>
    <article-title>Infant Botulism</article-title> 
    <source>J Perinatol.</source>
    <year iso-8601-date="2007">2007</year> 
    <volume>27</volume>
    <issue>3</issue>
    <fpage>175</fpage>
    <lpage>180</lpage> 
    <pub-id pub-id-type="pmid">17314986</pub-id> 
    <pub-id pub-id-type="doi">10.1038/sj.jp.7211651</pub-id> 
   </element-citation> 
  </ref> 
  <ref id="B8">
   <label>8</label> 
   <element-citation> 
    <object-id pub-id-type="doi">
     MyPub.20070215.03154.s435</object-id>
    ...
   </element-citation> 
  </ref> 
  ...
 </ref-list>
</book-back>
...
A <graphic> identifier 
...
<p>... This can be seen in the following:
 <disp-formula>
  <alternatives>

   <textual-form>(a + 3)<sup>2</sup> - (10 - b) = 24</textual-form>

   <graphic xmlns:xlink="http://www.w3.org/1999/xlink"
     xlink:href="fors2682.f3">
    <object-id>463492</object-id>
   </graphic>

   <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML">
    <mml:mrow>
     <mml:msup>
      <mml:mfenced>
       <mml:mrow>
        <mml:mi>a</mml:mi>
        <mml:mo>&plus;</mml:mo>
        <mml:mn>3</mml:mn>
       </mml:mrow>
      </mml:mfenced>
      <mml:mn>2</mml:mn>
     </mml:msup>
     <mml:mo>&minus;</mml:mo>
     <mml:mfenced>
      <mml:mrow>
       <mml:mi>10</mml:mi>
       <mml:mo>&minus;</mml:mo>
       <mml:mn>b</mml:mn>
      </mml:mrow>
     </mml:mfenced>
     <mml:mo>&equals;</mml:mo>
     <mml:mn>24</mml:mn>
    </mml:mrow>
   </mml:math>

  </alternatives>
 </disp-formula>
</p>
...