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@ -745,10 +745,9 @@ handler, which differs a lot from doing something equivalent with the
current Python-based one (for which XMP capability is available from current Python-based one (for which XMP capability is available from
recoll 1.23.2, but the new handler can be used with previous Recoll recoll 1.23.2, but the new handler can be used with previous Recoll
versions).</p></div> versions).</p></div>
<div class="paragraph"><p>This page was adapted from the text by Jeffrey Dick, using input from <div class="paragraph"><p>I based this page on the text by Jeffrey Dick, using input from Johannes
Johannes Menzel, (especially the result list paragraph format), Menzel for all examples about the new features. The discussion which led to
adapting things for the new handler. The discussion which led to the the updated handler is a
updated handler is a
<a href="https://bitbucket.org/medoc/recoll/issues/300/extracting-xmp-metadata-and-tmsu-tags">Bitbucket <a href="https://bitbucket.org/medoc/recoll/issues/300/extracting-xmp-metadata-and-tmsu-tags">Bitbucket
Recoll issue</a>.</p></div> Recoll issue</a>.</p></div>
</div> </div>
@ -787,46 +786,49 @@ to describe genre, topic, etc.</p></div>
</div> </div>
</div> </div>
<div class="sect1"> <div class="sect1">
<h2 id="_custom_indexing_fields_file">Custom indexing (fields file)</h2> <h2 id="_custom_indexing_short_example_fields_file">Custom indexing short example (fields file)</h2>
<div class="sectionbody"> <div class="sectionbody">
<div class="paragraph"><p>Let&#8217;s create two fields named "year" and "journal". The prefixes <div class="paragraph"><p>The following example (extract from a complete configuration shown later)
starting with "XY" are extension prefixes that are added to the terms creates two fields named "refjournal" and "refpages", which are both stored
in the Xapian database (Recoll internally does not use prefixes (so they can be displayed in result list entries), and indexed (you can
starting with XY). Additionally, the year and journal are stored so specifically search them).</p></div>
they can be displayed in the results list. Some other types of <div class="paragraph"><p>Some other types of metadata, such as title, author and keywords, are
metadata, such as title, author and keywords, are already indexed by already indexed by Recoll (the default rclpdf finds them using the
Recoll (the default rclpdf finds them using the <strong>pdftotext</strong> <strong>pdftotext</strong> command) so there is no need to add those to the [prefixes]
command) so there is no need to add those to the [prefixes] section.</p></div> section.</p></div>
<div class="paragraph"><p>Add this text to the fields file in your Recoll configuration <div class="paragraph"><p>This is taken from the <code>fields</code> file inside the configuration
directory (<em>~/.recoll/fields</em>).</p></div> (e.g. <em>~/.recoll/fields</em>).</p></div>
<div class="listingblock"> <div class="listingblock">
<div class="content"> <div class="content">
<pre><code>[prefixes] <pre><code>[prefixes]
year = XYEAR refjournal=RFJOURNAL
journal = XYJOUR refpages=RFPAGES
[stored] [stored]
bibtex:year = refjournal =
bibtex:journal =</code></pre> refpages =
[aliases]
refjournal = bibtex:journal bibtex:journaltitle
refpages = bibtex:pages</code></pre>
</div></div> </div></div>
</div> </div>
</div> </div>
<div class="sect1"> <div class="sect1">
<h2 id="_telling_the_handler_what_fields_to_extract">Telling the handler what fields to extract</h2> <h2 id="_telling_the_handler_what_fields_to_extract">Telling the handler what fields to extract</h2>
<div class="sectionbody"> <div class="sectionbody">
<div class="paragraph"><p>As of Recoll 1.23.2, the PDF handler has the capability to use <div class="paragraph"><p>As of Recoll 1.23.2, the PDF handler has the capability to use <strong>pdfinfo</strong>
<strong>pdfinfo</strong> for extracting XMP metadata. The switch for executing <strong>pdfinfo</strong> for extracting XMP metadata. The switch for executing <strong>pdfinfo</strong> is the
is the <em>pdfextrameta</em> configuration parameter, and the value of the <em>pdfextrameta</em> configuration parameter, and the value of the parameter is a
parameter is a list of XMP tags to extract, with optional conversion list of XMP tags to extract, with optional conversion to Recoll field names
to Recoll field names (the XMP qualified tag name is kept by (the XMP qualified tag name is kept by default, the translation is
default). Example:</p></div> separated by a <em>|</em> character). Example (without translations):</p></div>
<div class="listingblock"> <div class="listingblock">
<div class="content"> <div class="content">
<pre><code>pdfextrameta = bibtex:year bibtex:journal bibtex:booktitle|title</code></pre> <pre><code>pdfextrameta = bibtex:year bibtex:journal bibtex:journaltitle</code></pre>
</div></div> </div></div>
<div class="paragraph"><p>Here, <em>bibtex:year</em> and <em>bibtex:journal</em> are used directly, and <div class="paragraph"><p>Note that it is quite equivalent to translate a field name inside
<em>bibtex:booktitle</em> is translated to <em>title</em> (the example is not <em>pdfextrameta</em> or to uses aliases inside the <em>fields</em> file.</p></div>
supposed to make sense)</p></div>
</div> </div>
</div> </div>
<div class="sect1"> <div class="sect1">
@ -871,6 +873,11 @@ class MetaFixer(object):
return txt</code></pre> return txt</code></pre>
</div></div> </div></div>
<div class="paragraph"><p>The metadata-editing script can be modified to fill in the "journal" field for
BibTex entries that aren&#8217;t journal articles (e.g. bibtex:booktitle
for "InCollection" entries), by defining a <em>wrapup()</em> method which will
be called with the whole metadata array (an array of <em>(nm,value)</em>
pairs) for global editing/removing/addition.</p></div>
</div> </div>
</div> </div>
<div class="sect1"> <div class="sect1">
@ -886,11 +893,8 @@ HTML meta elements, and the &lt;body&gt; contains the text of the PDF.</p></div>
<div class="sect1"> <div class="sect1">
<h2 id="_result_paragraph_format">Result paragraph format</h2> <h2 id="_result_paragraph_format">Result paragraph format</h2>
<div class="sectionbody"> <div class="sectionbody">
<div class="paragraph"><p>Here, the result is formatted to show the title, which is a link <div class="paragraph"><p>The result paragraph format defines what fields are displayed inside Recoll
to open the document, in blue with underlining turned off. The next result list, and how they are formatted.</p></div>
two lines contain the authors, then the journal title in green
italicized text followed by year (in parentheses). The keywords are
listed in red after the abstract/text snippet.</p></div>
<div class="paragraph"><p>Edit this using the Recoll GUI: Preferences &gt; GUI configuration &gt; <div class="paragraph"><p>Edit this using the Recoll GUI: Preferences &gt; GUI configuration &gt;
Result List &gt; Edit result paragraph format string.</p></div> Result List &gt; Edit result paragraph format string.</p></div>
<div class="listingblock"> <div class="listingblock">
@ -922,26 +926,17 @@ listed in red after the abstract/text snippet.</p></div>
&lt;/table&gt;</code></pre> &lt;/table&gt;</code></pre>
</div></div> </div></div>
<div class="paragraph"><p>The screenshot below also has the <em>Highlight color for query terms</em> <div class="paragraph"><p>There are
set to <code>black; font-weight:bold;</code> for bold, black text (instead <a href="https://bitbucket.org/medoc/recoll/wiki/ResultsThumbnails">various
of the blue default). There methods for creating the thumbnails</a>; the ones here were made by opening
are linkhttps://bitbucket.org/medoc/recoll/wiki/ResultsThumbnails[various the directory containing the PDFs in the Dolphin file manager (part of KDE)
methods for creating the thumbnails]; the ones here were made by and selecting the Preview option.</p></div>
opening the directory containing the PDFs in the Dolphin file manager <div class="paragraph"><p>And the result:</p></div>
(part of KDE) and selecting the Preview option.</p></div> <div class="imageblock">
<div class="content">
<img src="recoll_query.png" alt="Result list display" />
</div> </div>
</div> </div>
<div class="sect1">
<h2 id="_a_search_example">A search example</h2>
<div class="sectionbody">
<div class="paragraph"><p>The simple query is <code>cerevisiae keyword:protein</code>. This
returns only PDFs that have the text "cerevisiae" and have been
tagged with the "protein" keyword. The LaTeX-style formatting from
the BibTeX database is displayed as HTML (note the italicized words
in article title, and umlaut in author&#8217;s name). Other queries could
be made based on the PDF metadata, e.g. <em>journal:plos</em>
r <em>year:2013</em>.</p></div>
<div class="paragraph"><p>image::recoll_query.png</p></div>
</div> </div>
</div> </div>
<div class="sect1"> <div class="sect1">
@ -967,15 +962,194 @@ The sort buttons (up- and down-arrows) in Recoll sort the
the result list using the stored date of the file (using "%D" in the the result list using the stored date of the file (using "%D" in the
result paragraph format, and date format "%Y") instead of having to result paragraph format, and date format "%Y") instead of having to
add the year to the index as shown above.</p></div> add the year to the index as shown above.</p></div>
<div class="ulist"><ul> </div>
<li> </div>
<p> <div class="sect1">
The filter can be modified to fill in the "journal" field for <h2 id="_complete_example">Complete example</h2>
BibTex entries that aren&#8217;t journal articles (e.g. bibtex:booktitle <div class="sectionbody">
for "InCollection" entries). <div class="paragraph"><p>This was designed by Johannes Menzel, who kindly provided the data when we
</p> worked on improving PDF XMP data extraction. The originals are listed in
</li> this
</ul></div> <a href="https://bitbucket.org/medoc/recoll/issues/300/extracting-xmp-metadata-and-tmsu-tags">BitBucket issue</a></p></div>
<div class="paragraph"><p>The paragraph format is listed above.</p></div>
<div class="sect2">
<h3 id="_em_recoll_conf_em_additions"><em>recoll.conf</em> additions:</h3>
<div class="listingblock">
<div class="content">
<pre><code>pdfextrameta = bibtex:journal bibtex:journaltitle bibtex:pages \
bibtex:volume bibtex:number bibtex:booktitle bibtex:year bibtex:author \
bibtex:title bibtex:isbn bibtex:issn bibtex:editor bibtex:address \
bibtex:location bibtex:doi bibtex:chapter bibtex:url bibtex:entrytype \
bibtex:bibtexkey bibtex:abstract bibtex:date bibtex:keywords \
bibtex:comment bibtex:language bibtex:edition bibtex:totalpages \
dc:creator dc:relation dc:publisher dc:title dc:type dc:identifier
defaultcharset = UTF-8//
pdfextrametafix = /home/hannes/.recoll/metafix.py</code></pre>
</div></div>
</div>
<div class="sect2">
<h3 id="_em_metafix_py_em_script"><em>metafix.py</em> script:</h3>
<div class="listingblock">
<div class="content">
<pre><code>import sys
import re
# This can be used for local XMP field editing.
#
# A new instance is created for each PDF document (so the object could
# keep state to avoid, e.g. duplicate values)
#
# The metafix method receives an (original) field name, and the text
# value, and should return the possibly modified text.
class MetaFixer(object):
def __init__(self):
pass
def metafix(self, nm, txt):
if nm == 'bibtex:pages':
txt = re.sub(r'--', '-', txt)
txt = re.sub(r'^', ', p. ', txt)
elif nm == 'bibtex:author':
txt = re.sub(r'$', ':\ ', txt)
pass
elif nm == 'bibtex:chapter':
txt = re.sub(r'^', ', in: id.: ', txt)
pass
elif nm == 'bibtex:editor':
txt = re.sub(r'^', ', in: ', txt)
txt = re.sub(r'$', ' (ed.):\ ', txt)
pass
elif nm == 'bibtex:year':
txt = re.sub(r'^', ', ', txt)
pass
elif nm == 'bibtex:date':
txt = re.sub(r'^', ', ', txt)
pass
elif nm == 'bibtex:volume':
txt = re.sub(r'^', ', vol. ', txt)
pass
elif nm == 'bibtex:number':
txt = re.sub(r'^', ', no. ', txt)
pass
elif nm == 'bibtex:journaltitle':
txt = re.sub(r'^', ', in: ', txt)
pass
elif nm == 'bibtex:journal':
txt = re.sub(r'^', ', in: ', txt)
pass
elif nm == 'bibtex:title':
txt = re.sub(r'^', '"', txt)
txt = re.sub(r'$', '"', txt)
pass
elif nm == 'bibtex:location':
txt = re.sub(r'^', ', ', txt)
txt = re.sub(r'$', ':\ ', txt)
pass
elif nm == 'bibtex:address':
txt = re.sub(r'^', ', ', txt)
txt = re.sub(r'$', ':\ ', txt)
pass
elif nm == 'bibtex:isbn':
txt = re.sub(r'^', 'ISBN: ', txt)
pass
elif nm == 'bibtex:issn':
txt = re.sub(r'^', 'ISSN: ', txt)
pass
elif nm == 'bibtex:doi':
txt = re.sub(r'^', 'DOI: ', txt)
pass
elif nm == 'bibtex:bibtexkey':
txt = re.sub(r'^', 'Key: ', txt)
pass
return txt</code></pre>
</div></div>
</div>
<div class="sect2">
<h3 id="_em_fields_em_file"><em>fields</em> file:</h3>
<div class="listingblock">
<div class="content">
<pre><code>[prefixes]
refjournal=RFJOURNAL
refpages=RFPAGES
reftitle=RFTTITLE
refvolume=RFVOLUME
refauthor=RFAUTHOR
refyear=RFYYEAR
refisbn=RFISBN
refissn=RFISSN
refdoi=RFDOI
refeditor=RFEDITOR
refpublisher=RFPUBLISHER
refaddress=RFADDRESS
reflocation=RFLOCATION
refbooktitle=RFBOOKTITLE
refurl=RFURL
reftype=RFTYPE
refkey=RFKEY
refabstract=RFABSTRACT
refkeywords=RFKEYWORDS
refcomment=RFCOMMENT
refedition=RFEDITION
reflanguage=RFLANGUAGE
[stored]
refjournal=
refpages=
reftitle=
refvolume=
refauthor=
refyear=
refisbn=
refissn=
refdoi=
refeditor=
refpublisher=
refaddress=
reflocation=
refbooktitle=
refurl=
reftype=
refkey=
refabstract=
refkeywords=
refcomment=
refedition=
reflanguage=
refid=
[aliases]
refjournal = bibtex:journal bibtex:journaltitle
refpages = bibtex:pages
reftitle = bibtex:title
refvolume = bibtex:volume
refauthor = bibtex:author
refyear = bibtex:year bibtex:date
refid = dc:identifier bibtex:isbn bibtex:issn
refisbn = bibtex:isbn
refissn = bibtex:issn
refdoi = bibtex:doi
refeditor = bibtex:editor
refpublisher = bibtex:publisher
refaddress = bibtex:address
reflocation = bibtex:location
refbooktitle = bibtex:booktitle
refurl = bibtex:url
reftype = bibtex:entrytype bibtex:type
refkey = bibtex:bibtexkey
refabstract = bibtex:abstract
refkeywords = bibtex:keywords
refcomment = bibtex:comment
refedition = bibtex:edition
reflanguage = bibtex:language
author = xesam:author</code></pre>
</div></div>
</div>
</div> </div>
</div> </div>
</div> </div>
@ -983,7 +1157,7 @@ The filter can be modified to fill in the "journal" field for
<div id="footer"> <div id="footer">
<div id="footer-text"> <div id="footer-text">
Last updated Last updated
2017-05-17 07:27:42 CEST 2017-05-23 09:26:52 CEST
</div> </div>
</div> </div>
</body> </body>

291
website/recoll_XMP/index.txt
View File

@ -8,10 +8,9 @@ current Python-based one (for which XMP capability is available from
recoll 1.23.2, but the new handler can be used with previous Recoll recoll 1.23.2, but the new handler can be used with previous Recoll
versions). versions).
This page was adapted from the text by Jeffrey Dick, using input from I based this page on the text by Jeffrey Dick, using input from Johannes
Johannes Menzel, (especially the result list paragraph format), Menzel for all examples about the new features. The discussion which led to
adapting things for the new handler. The discussion which led to the the updated handler is a
updated handler is a
link:https://bitbucket.org/medoc/recoll/issues/300/extracting-xmp-metadata-and-tmsu-tags[Bitbucket link:https://bitbucket.org/medoc/recoll/issues/300/extracting-xmp-metadata-and-tmsu-tags[Bitbucket
Recoll issue]. Recoll issue].
@ -42,46 +41,51 @@ to describe genre, topic, etc.
image::jabref_metadata.png[Editing metadata with jabref] image::jabref_metadata.png[Editing metadata with jabref]
== Custom indexing (fields file) == Custom indexing short example (fields file)
Let's create two fields named "year" and "journal". The prefixes The following example (extract from a complete configuration shown later)
starting with "XY" are extension prefixes that are added to the terms creates two fields named "refjournal" and "refpages", which are both stored
in the Xapian database (Recoll internally does not use prefixes (so they can be displayed in result list entries), and indexed (you can
starting with XY). Additionally, the year and journal are stored so specifically search them).
they can be displayed in the results list. Some other types of
metadata, such as title, author and keywords, are already indexed by Some other types of metadata, such as title, author and keywords, are
Recoll (the default rclpdf finds them using the *pdftotext* already indexed by Recoll (the default rclpdf finds them using the
command) so there is no need to add those to the [prefixes] section. *pdftotext* command) so there is no need to add those to the [prefixes]
section.
This is taken from the `fields` file inside the configuration
(e.g. '~/.recoll/fields').
Add this text to the fields file in your Recoll configuration
directory ('~/.recoll/fields').
---- ----
[prefixes] [prefixes]
year = XYEAR refjournal=RFJOURNAL
journal = XYJOUR refpages=RFPAGES
[stored] [stored]
bibtex:year = refjournal =
bibtex:journal = refpages =
[aliases]
refjournal = bibtex:journal bibtex:journaltitle
refpages = bibtex:pages
---- ----
== Telling the handler what fields to extract == Telling the handler what fields to extract
As of Recoll 1.23.2, the PDF handler has the capability to use As of Recoll 1.23.2, the PDF handler has the capability to use *pdfinfo*
*pdfinfo* for extracting XMP metadata. The switch for executing *pdfinfo* for extracting XMP metadata. The switch for executing *pdfinfo* is the
is the 'pdfextrameta' configuration parameter, and the value of the 'pdfextrameta' configuration parameter, and the value of the parameter is a
parameter is a list of XMP tags to extract, with optional conversion list of XMP tags to extract, with optional conversion to Recoll field names
to Recoll field names (the XMP qualified tag name is kept by (the XMP qualified tag name is kept by default, the translation is
default). Example: separated by a '|' character). Example (without translations):
---- ----
pdfextrameta = bibtex:year bibtex:journal bibtex:booktitle|title pdfextrameta = bibtex:year bibtex:journal bibtex:journaltitle
---- ----
Here, 'bibtex:year' and 'bibtex:journal' are used directly, and Note that it is quite equivalent to translate a field name inside
'bibtex:booktitle' is translated to 'title' (the example is not 'pdfextrameta' or to uses aliases inside the 'fields' file.
supposed to make sense)
== Editing the field values == Editing the field values
@ -127,6 +131,13 @@ class MetaFixer(object):
return txt return txt
---- ----
The metadata-editing script can be modified to fill in the "journal" field for
BibTex entries that aren't journal articles (e.g. bibtex:booktitle
for "InCollection" entries), by defining a 'wrapup()' method which will
be called with the whole metadata array (an array of '(nm,value)'
pairs) for global editing/removing/addition.
== Indexing == Indexing
Then index away! Then index away!
@ -138,11 +149,8 @@ HTML meta elements, and the <body> contains the text of the PDF.
== Result paragraph format == Result paragraph format
Here, the result is formatted to show the title, which is a link The result paragraph format defines what fields are displayed inside Recoll
to open the document, in blue with underlining turned off. The next result list, and how they are formatted.
two lines contain the authors, then the journal title in green
italicized text followed by year (in parentheses). The keywords are
listed in red after the abstract/text snippet.
Edit this using the Recoll GUI: Preferences > GUI configuration > Edit this using the Recoll GUI: Preferences > GUI configuration >
Result List > Edit result paragraph format string. Result List > Edit result paragraph format string.
@ -177,26 +185,15 @@ Edit this using the Recoll GUI: Preferences > GUI configuration >
---- ----
The screenshot below also has the 'Highlight color for query terms' There are
set to `black; font-weight:bold;` for bold, black text (instead link:https://bitbucket.org/medoc/recoll/wiki/ResultsThumbnails[various
of the blue default). There methods for creating the thumbnails]; the ones here were made by opening
are linkhttps://bitbucket.org/medoc/recoll/wiki/ResultsThumbnails[various the directory containing the PDFs in the Dolphin file manager (part of KDE)
methods for creating the thumbnails]; the ones here were made by and selecting the Preview option.
opening the directory containing the PDFs in the Dolphin file manager
(part of KDE) and selecting the Preview option.
And the result:
== A search example image::recoll_query.png[Result list display]
The simple query is `cerevisiae keyword:protein`. This
returns only PDFs that have the text "cerevisiae" and have been
tagged with the "protein" keyword. The LaTeX-style formatting from
the BibTeX database is displayed as HTML (note the italicized words
in article title, and umlaut in author's name). Other queries could
be made based on the PDF metadata, e.g. 'journal:plos'
r 'year:2013'.
image::recoll_query.png
== More possibilities == More possibilities
@ -216,6 +213,190 @@ the result list using the stored date of the file (using "%D" in the
result paragraph format, and date format "%Y") instead of having to result paragraph format, and date format "%Y") instead of having to
add the year to the index as shown above. add the year to the index as shown above.
- The filter can be modified to fill in the "journal" field for
BibTex entries that aren't journal articles (e.g. bibtex:booktitle == Complete example
for "InCollection" entries).
This was designed by Johannes Menzel, who kindly provided the data when we
worked on improving PDF XMP data extraction. The originals are listed in
this
link:https://bitbucket.org/medoc/recoll/issues/300/extracting-xmp-metadata-and-tmsu-tags[BitBucket issue]
The paragraph format is listed above.
=== 'recoll.conf' additions:
----
pdfextrameta = bibtex:journal bibtex:journaltitle bibtex:pages \
bibtex:volume bibtex:number bibtex:booktitle bibtex:year bibtex:author \
bibtex:title bibtex:isbn bibtex:issn bibtex:editor bibtex:address \
bibtex:location bibtex:doi bibtex:chapter bibtex:url bibtex:entrytype \
bibtex:bibtexkey bibtex:abstract bibtex:date bibtex:keywords \
bibtex:comment bibtex:language bibtex:edition bibtex:totalpages \
dc:creator dc:relation dc:publisher dc:title dc:type dc:identifier
defaultcharset = UTF-8//
pdfextrametafix = /home/hannes/.recoll/metafix.py
----
=== 'metafix.py' script:
----
import sys
import re
# This can be used for local XMP field editing.
#
# A new instance is created for each PDF document (so the object could
# keep state to avoid, e.g. duplicate values)
#
# The metafix method receives an (original) field name, and the text
# value, and should return the possibly modified text.
class MetaFixer(object):
def __init__(self):
pass
def metafix(self, nm, txt):
if nm == 'bibtex:pages':
txt = re.sub(r'--', '-', txt)
txt = re.sub(r'^', ', p. ', txt)
elif nm == 'bibtex:author':
txt = re.sub(r'$', ':\ ', txt)
pass
elif nm == 'bibtex:chapter':
txt = re.sub(r'^', ', in: id.: ', txt)
pass
elif nm == 'bibtex:editor':
txt = re.sub(r'^', ', in: ', txt)
txt = re.sub(r'$', ' (ed.):\ ', txt)
pass
elif nm == 'bibtex:year':
txt = re.sub(r'^', ', ', txt)
pass
elif nm == 'bibtex:date':
txt = re.sub(r'^', ', ', txt)
pass
elif nm == 'bibtex:volume':
txt = re.sub(r'^', ', vol. ', txt)
pass
elif nm == 'bibtex:number':
txt = re.sub(r'^', ', no. ', txt)
pass
elif nm == 'bibtex:journaltitle':
txt = re.sub(r'^', ', in: ', txt)
pass
elif nm == 'bibtex:journal':
txt = re.sub(r'^', ', in: ', txt)
pass
elif nm == 'bibtex:title':
txt = re.sub(r'^', '"', txt)
txt = re.sub(r'$', '"', txt)
pass
elif nm == 'bibtex:location':
txt = re.sub(r'^', ', ', txt)
txt = re.sub(r'$', ':\ ', txt)
pass
elif nm == 'bibtex:address':
txt = re.sub(r'^', ', ', txt)
txt = re.sub(r'$', ':\ ', txt)
pass
elif nm == 'bibtex:isbn':
txt = re.sub(r'^', 'ISBN: ', txt)
pass
elif nm == 'bibtex:issn':
txt = re.sub(r'^', 'ISSN: ', txt)
pass
elif nm == 'bibtex:doi':
txt = re.sub(r'^', 'DOI: ', txt)
pass
elif nm == 'bibtex:bibtexkey':
txt = re.sub(r'^', 'Key: ', txt)
pass
return txt
----
=== 'fields' file:
----
[prefixes]
refjournal=RFJOURNAL
refpages=RFPAGES
reftitle=RFTTITLE
refvolume=RFVOLUME
refauthor=RFAUTHOR
refyear=RFYYEAR
refisbn=RFISBN
refissn=RFISSN
refdoi=RFDOI
refeditor=RFEDITOR
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----

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