OBO cross-references

Capture cross-references to other sections within the same bibliography in xref elements. Capture cross-references to other bibliographies in different documents as extRef elements.

//xrefGrp/xref

The cross-reference text is indicated by surrounding asterisks. Remove the asterisks and:

For a cross-references to another section in the same bibliography, capture the cross-reference using an xref element within an xrefGrp group. Give the ref attribute of the xref element the value of the id attribute of the target section.
For cross-references to another bibliography, the target document id is provided in brackets after the link text. Capture the cross-reference using an extRef element with a docRef attribute containing the id of the target document.

Text

evidence is most plentiful. But *Greek Law* is not an entirely useless concept

Markup


      <p>...evidence is most plentiful. But <xrefGrp>
                 <xref ref="obo-9780195390155-0021-div1-0003">Greek Law</xref>
             </xrefGrp> is not an entirely useless concept ...</p>

Text

The article on *Gothic Art[obo-9780195396584-0040]* will provide more references ...

Markup


      <p>The article on <xrefGrp>
                 <extRef docRef="obo-9780195396584-0040" sysId="obo-9780195396584.xml">Gothic Art</extRef>
             </xrefGrp> will provide more references
        ...</p>