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 the NCBI Book DTD and NCBI Collection 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, the DTD previously used by NCBI included a metadata element <acidfree>, which has no counterpart in the NCBI Book Tag Set and NCBI Collection Tag Set; the content of this element, however, may be preserved by use of the <custom-meta> element, with a <meta-name> of “acidfree” and a <meta-value> containing a statement about the paper of the book.
<!ELEMENT meta-name (#PCDATA %meta-name-elements;)* >
Any combination of:
... <book-meta> ... <custom-meta-wrap> <custom-meta> <meta-name>acidfree</meta-name> <meta-value>yes</meta-value> </custom-meta> <custom-meta> <meta-name>price</meta-name> <meta-value>US $28.50</meta-value> </custom-meta> <custom-meta> <meta-name>miscinfo</meta-name> <meta-value>CDs included, Windows XP required; 1GB processor, 512 MB RAM recommended</meta-value> </custom-meta> </custom-meta-wrap> ... </book-meta> ...