SYNOPSIS

# Set literal values
marc_add('900', a, 'test' , 'b', test)
marc_add('900', ind1 , ' ' , a, 'test' , 'b', test)
marc_add('900', ind1 , ' ' , a, 'test' , 'b', test , record:record2)
# Copy data from an other field (when the field value is an array, the
# subfield will be repeated)
marc_add('900', a, '$.my.data.field')

DESCRIPTION

Read our Wiki pages at <https://github.com/LibreCat/Catmandu/wiki/Fixes> for a complete overview of the Fix language.