mc2skos 0.5.1

Installation

Releases can be installed from the command line with pip:

$ pip install --upgrade mc2skos             # with virtualenv or as root
$ pip install --upgrade --user mc2skos      # install to ~/.local

• Works with both Python 2.x and 3.x. See Travis for details on tested Python versions.

• If lxml fails to install on Windows, try the windows installer from from PyPI.

• If lxml fails to install on Unix, install system packages python-dev and libxml2-dev

• Make sure the Python scripts folder has been added to your PATH.

To directly use a version from source code repository:

$ git clone https://github.com/scriptotek/mc2skos.git
$ cd mc2skos
$ pip install -e .

Usage

mc2skos infile.xml outfile.ttl      # from file to file
mc2skos infile.xml > outfile.ttl    # from file to standard output

Run mc2skos --help or mc2skos -h for options.

URIs

Concept URIs are generated from an URI template specified with option --uri. The following template parameters are recognized:

• {collection} is “class”, “table” or “scheme”

• {object} is a member of the classification scheme and part of a {collection}, such as a specific class or table.

• {edition} is taken from 084 $c (with language code stripped)

The following default URI template are used for known concept scheme identifiers in 084 $a:

• ddc: http://dewey.info/{collection}/{object}/e{edition}/ (DDC)

• bkl: http://uri.gbv.de/terminology/bk/{object} (Basisklassifikation)

To add skos:inScheme statements to all records, an URI template must be specified with option --scheme or it is derived from a known default template.

To add an additional skos:inScheme statement to table records, an URI template must be specified with option --table_scheme or it is derived from a known default template.

The following example is generated from a DDC table record:

<http://dewey.info/class/6--982/e21/> a skos:Concept ;
    skos:inScheme <http://dewey.info/scheme/edition/e21/>,
                  <http://dewey.info/table/6/e21/> ;
    skos:notation "T6--982" ;
    skos:prefLabel "Chibchan and Paezan languages"@en .

Mapping schema

Only a small part of the MARC21 Classification data model is converted, and the conversion follows a rather pragmatic approach, exemplified by the mapping of the 7XX fields to skos:altLabel.

@prefix mads: <http://www.loc.gov/mads/rdf/v1#> .

<http://dewey.info/class/001.30973/e23/> a skos:Concept ;
    mads:componentList (
        <http://dewey.info/class/001.3/e23/>
        <http://dewey.info/class/1--09/e23/>
        <http://dewey.info/class/2--73/e23/>
    ) ;
    skos:notation "001.30973" .

PREFIX mads: <http://www.loc.gov/mads/rdf/v1#>
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
PREFIX skos: <http://www.w3.org/2004/02/skos/core#>

SELECT ?c1_notation ?c1_label ?c2_notation ?c2_label
WHERE { GRAPH <http://localhost/ddc23no> {

    <http://dewey.info/class/001.30973/e23/> mads:componentList ?l .
        ?l rdf:rest* ?sl .
        ?sl rdf:first ?e1 .
        ?sl rdf:rest ?sln .
        ?sln rdf:first ?e2 .

        ?e1 skos:notation ?c1_notation .
        ?e2 skos:notation ?c2_notation .

        OPTIONAL {
            ?e1 skos:prefLabel ?c1_label .
        }
        OPTIONAL {
            ?e2 skos:prefLabel ?c2_label .
        }
}}