Issue meta: Issue identifier

Capture the issue identifier details in an issue-identifier element.

issue-meta/issue-identifier

Use the issue-identifier element to declare the following issue details:

Print ISSN
Electronic ISSN
Volume
Issue

Use an issn element for both print and electronic ISSN with a pub-type attribute and attribute value "ppub" and "epub". If either ISSN does not exist then include a self closing tag. If included, the ISSN must be 8 characters separated by a hypen.

Use a volume and issue element that matches that of the article.

See also Issue meta: Root element and Complex volume and issue values for tagging on supplement issues.

For volumeless issues and issueless volumes, use a self closing tag with content-type ="empty".

Issue supplement

<issue-identifier>                   
    <issn pub-type="ppub">0887-6177</issn>                   
    <issn pub-type="epub">1873-5843</issn>                   
    <volume>31</volume>                   
    <issue>Supplement_1</issue>
</issue-identifier>

Standard Issue

<issue-identifier>                   
    <issn pub-type="ppub">0887-6177</issn>                   
    <issn pub-type="epub">1873-5843</issn>                   
    <volume>31</volume>                   
    <issue>1</issue>
</issue-identifier>

Volumeless Issue / Issueless Volume

<issue-identifier>                   
    <issn pub-type="ppub">0887-6177</issn>                   
    <issn pub-type="epub">1873-5843</issn>                   
    <volume content-type="empty"/>                  
    <issue>1</issue>
</issue-identifier> 

or

<issue-identifier>                   
    <issn pub-type="ppub">0887-6177</issn>                   
    <issn pub-type="epub">1873-5843</issn>                   
    <volume>31</volume>                   
    <issue content-type="empty"/>
</issue-identifier>