Element identifiers (id attribute)

Add a unique id attribute value to any element where the id attribute is required. Within a document xref links use the id value as the target.

//@id

Root element ID format

For the root element (where this is not a partial capture), the id attribute value follows the format:

productID-documentID

Where:

productID: identifies the online service or publishing area the document belongs to. The Product specific TCI provides the value for productID.
documentID: identifies the document uniquely within the service or publishing area. For online only content, OUP provide the documentID. In the case of a book, this is the ISBN13, where ISBN13 means the 13-digit ISBN for a book.

Chapter/entry/article ID format

For chapter, e, miscMatter, bibliography, appendix, and indexList elements and their ancestors (for example mainText, part, frontMatter, or endMatter elements), the id attribute value follows the format:

productID-documentID-elementName-nn

miscMatter, bibliography, and appendix in this topic means only miscMatter,bibliography, and appendix elements within frontMatter and endMatter to a book. For these elements that appear within the chapter or e level, these items must include the ancestor id of the chapter or e element (per ID format for other elements below).

Where:

elementName: the name of the element that contains this identifier.
nn: a unique and sequential numeric value, that follows on from the preceding element with the same name.

ID format for other elements

For elements within chapter, e, miscMatter, bibliography, appendix, and indexList the id attribute value follows the format:

ancestorID-elementName-nn

Where:

ancestorID: represents the chapter, e, miscMatter, bibliography, appendix, or indexList ancestor of this element

Where present, do not include the namespace prefix, for example for m:math use math.


      <div2 id="acref-9780199279784-e-1-div2-1"/>


      <xrefGrp>
             <xref id="acref-9780199279784-e-1-xref-9" ref="acref-9780199279784-e-1-div2-1"/>
         </xrefGrp>


      <m:math xmlns:m="http://www.w3.org/1998/Math/MathML" id="oso-9780199279784-chapter-3-math-1"/>

Root element ID format

Chapter/entry/article ID format

ID format for other elements

Sub-topics