Add new field to biblatex entries

Many of the books I use are parts of series. `biblatex` gives you more fields to add bibliographic information to than BibTeX does, but it has no fields appropriate for the editor of a series. If I use the `EDITOR` field, the bibliography will (by default) print `edited by`, which doesn't give the right impression of what the role of the series editor is.

I'm wondering if there is any easy way to add a new field `SERIESEDITOR`, which will make `biblatex` by default print its content preceded by `Series edited by` or make sure that whatever is in `SERIESEDITOR` gets printed directly after the name of the series, such that is says something like `[Name of series], edited by [series editor]`. In other words, is there any way I can do this in the preamble of my document, without having to venture into writing new bibliography styles?

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`biblatex 2.0+` and `biber 1.0+` allow you to define additional fields and entry types, but this is intended for style authors and can't be used in the document preamble.

With `biber`'s source map feature you can however use the field `serieseditor` and map it to a field defined in the default data model, such as `namea`. This existing field can then be printed in the bibliography macro that sets the `series` field.

``````\DeclareSourcemap{
\maps[datatype=bibtex]{
\map{
\step[fieldsource=serieseditor,fieldtarget=namea]
}
}
}

\renewbibmacro*{series+number}{%
\printfield{series}%
\printfield{number}%
\ifnameundef{namea}
{}
Since version 2 (and in combination with `biber`, version 1 or greater) `biblatex` allows you define any kind of additional field. Check out chapter 4.5.2 of the `biblatex` manual.
I did look there, but I didn't, and don't, understand what I need to do to make `biblatex` parse a field I've added to my entries. –  Sverre Jul 31 '12 at 19:01
To have `biblatex` parse it you must of course adapt the style files. For example, if you add a field `serieseditor`, you must look which parts of the .bbx/.cbx should handle this field and write the needed adaptation. –  Simifilm Jul 31 '12 at 19:26