Issue meta: Journal identifier

Capture the issue identifier details in a journal-id element with journal-id-type="publisher-id".

            issue-meta/journal-id[@journal-id-type='publisher-id']

Use the journal-id element to declare the journal publisher ID.

Example

        <issue-meta>
            <journal-id journal-id-type="publisher-id">acn</journal-id>    
            <issue-identifier>           
                <issn pub-type="ppub">0887-6177</issn>                   
                <issn pub-type="epub">1873-5843</issn>                   
                <volume>31</volume>                   
                <issue>1</issue>
            </issue-identifier> 
            
            ...
        
        </issue-meta>