NAME

       Biber::Entry - Biber::Entry objects

   new
           Initialize a Biber::Entry object

           There are three types of field possible in an entry:

           * data    - These are fields which derive directly from or are themselves fields in the
                       data source. Things like YEAR, MONTH, DAY etc. are such fields which are
                       derived from, for example, the DATE field. They are part of the original
                       data implicitly, derived from a field.
           * derived - These are fields, often meta-information like labelname, labelalpha etc.
                       which are more removed from the data fields.

           The reason for this division is largely the entry cloning required for the related entry and
           inheritance features. When we clone an entry or copy some fields from one entry to another
           we generally don't want the "derived" category as such derived meta-fields will often need
           to be re-created or ignored so we need to know which are the actual "data" fields to
           copy/clone.

   relclone
           Recursively create related entry clones starting with an entry

   clone
           Clone a Biber::Entry object and return a copy
           Accepts optionally a key for the copy

   notnull
           Test for an empty object

   set_labelname_info
         Record the labelname information. This is special
         meta-information so we have a separate method for this
         Takes a hash ref with the information.

   get_labelname_info
         Retrieve the labelname information. This is special
         meta-information so we have a separate method for this
         Returns a hash ref with the information.

   set_labelnamefh_info
         Record the fullhash labelname information. This is special
         meta-information so we have a separate method for this
         Takes a hash ref with the information.

   get_labelnamefh_info
         Retrieve the fullhash labelname information. This is special
         meta-information so we have a separate method for this
         Returns a hash ref with the information.

   set_labeltitle_info
         Record the labeltitle information. This is special
         meta-information so we have a separate method for this
         Takes a hash ref with the information.

   get_labeltitle_info
         Retrieve the labeltitle information. This is special
         meta-information so we have a separate method for this
         Returns a hash ref with the information.

   set_labeldate_info
         Record the labeldate information. This is special
         meta-information so we have a separate method for this
         Takes a hash ref with the information.

   get_labeldate_info
         Retrieve the labeldate information. This is special
         meta-information so we have a separate method for this
         Returns a hash ref with the information.

   set_field
         Set a derived field for a Biber::Entry object, that is, a field
         which was not an actual bibliography field

   get_field
           Get a field for a Biber::Entry object
           Uses // as fields can be null (end dates etc).

   set_datafield
           Set a field which is in the .bib data file

   get_datafield
           Get a field that was in the original data file

   del_field
           Delete a field in a Biber::Entry object

   del_datafield
           Delete an original data source data field in a Biber::Entry object

   field_exists
           Check whether a field exists (even if null)

   date_fields_exist
           Check whether any parts of a date field exist when passed a datepart field name

   datafields
           Returns a sorted array of the fields which came from the data source

   count_datafields
           Returns the number of datafields

   derivedfields
           Returns a sorted array of the fields which were added during processing

   fields
           Returns a sorted array of all field names, including ones
           added during processing which are not necessarily fields
           which came from the data file

   count_fields
           Returns the number of fields

   has_keyword
           Check if a Biber::Entry object has a particular keyword in
           in the KEYWORDS field.

   add_warning
           Append a warning to a Biber::Entry object

   set_inherit_from
           Inherit fields from first child entry

           $entry->set_inherit_from($firstchild);

           Takes a second Biber::Entry object as argument

           The purpose here is to inherit fields so that sorting/labelling defaults
           can be generated for set parents from the first child set member data, unless
           the set parent itself already has some fields set that will do this. Set
           parents only have certain fields output in the .bbl and those that output but
           are not used in sorting/labelling data generation should not be inherited.

   resolve_xdata
           Recursively resolve XDATA fields in an entry

           $entry->resolve_xdata($xdata_entry);

   inherit_from
           Inherit fields from parent entry (as indicated by the crossref field)

           $entry->inherit_from($parententry);

           Takes a second Biber::Entry object as argument
           Uses the crossref inheritance specifications from the .bcf

   dump
           Dump Biber::Entry object

AUTHORS

       Francois Charette, "<firmicus at ankabut.net>" Philip Kime "<philip at kime.org.uk>"

BUGS

       Please report any bugs or feature requests on our Github tracker at
       <https://github.com/plk/biber/issues>.

COPYRIGHT & LICENSE

       Copyright 2009-2017 Francois Charette and Philip Kime, all rights reserved.

       This module is free software.  You can redistribute it and/or modify it under the terms of
       the Artistic License 2.0.

       This program is distributed in the hope that it will be useful, but without any warranty;
       without even the implied warranty of merchantability or fitness for a particular purpose.