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source-id Source Identifier

Identifier of a journal, book, conference proceedings, or other publication that is (or contains) the target of the <related-object>.

Usage/Remarks

Used along with @source-id-type to identify the publication that is (or contains) the target of the <related-object> element. The @source-id might contain an ISBN as content, and the @source-id-type should indicate that this identifier is an ISBN.

Best Practice

For each source, document, and object, an identifier is specified on the corresponding attribute. If the source and document are the same, the @source-id attribute should be empty. If the document and object are the same, the @object-id attribute should be empty. The @document-id attribute should always be specified.
OPTIONAL on element: <related-object>
Value Meaning
Text, numbers, or special characters The identifier of the source for the <related-object>.
Restriction @source-id is an optional attribute; there is no default.
Tagged Sample

External identifier for a book (<related-object>) 

...
<related-object source-id="http://www.ncbi.nlm.nih.gov/entrez/
  query.fcgi?cmd=Retrieve&amp;dopt=Expanded&amp;db=nlmcatalog&amp;list_uids=1252893"
  source-id-type="url" source-type="book">
 <person-group person-group-type="editor">...</person-group>
 <source>Disease and Mortality in Sub-Saharan Africa</source>
 ...
</related-object>
...