The field name of a custom metadata element, inserted to capture metadata information that is beyond this Tag Set
Some Tag Sets allow for metadata above and beyond that which is specified in this Tag Set. To capture this metadata during conversion, use the <custom-meta> element, which contains one name/value pair with few constraints on the length or content of the value. For example, if an element named <prev-journal-title> contains an older title for this journal, as part of the journal metadata, use the <custom-meta> element, with a <meta-name> of “prev-journal-title” and a <meta-value> containing the older name.
<!ELEMENT meta-name (#PCDATA %meta-name-elements;)* >
(#PCDATA)*
Text, numbers, or special characters, zero or more
...
<front>
<journal-meta>
<journal-id>BioDiv Mut</journal-id>
<journal-title-group>
<journal-title>Biodiversity & Mutation</journal-title>
</journal-title-group>
<issn>...</issn>
</journal-meta>
<article-meta>
<title-group>
<article-title>Black Smokers Sufrous Life</article-title>
</title-group>
<pub-date><year>2009</year></pub-date>
<fpage>87</fpage><lpage>93</lpage>
<custom-meta-group>
<custom-meta>
<meta-name>prev-journal-title</meta-name>
<meta-value>Evolution of Biodiversity</meta-value>
</custom-meta>
</custom-meta-group>
</article-meta>
</front>
...
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