Archivos diarios: 2012/02/23

Estructura de los archivos de importación de items

A un repositorio normalmente le llega el momento de realizar una importación masiva de items, sin tener que recurrir al método de carga de uno en uno de la interfaz de usuario.  El método estándar de importación es mediante el formato simple de archivo  (simple archive format) y el uso por línea de comandos del import. El comando import tratará de importar una estructura de directorio-subdirectorios y ficheros con una estructura predeterminada (es decir la Simple archive format). Cada subdirectorio corresponde a un item final de nuestro Dspace y contiene una serie de ficheros para lograr la descripción completa del item.

Esta estructura es :

Realmente, los únicos ficheros importantes y/o necesarios son el dublin_core.xml y el contents. Aclaremos, normalmente tendremos ficheros de contenidos (bitstreams),  pero en sentido estricto, el fichero o ficheros de bitstreams podrían no existir en un item sólo con metadatos y en ese caso, el contents sería un fichero vacio. Extraño caso de uso del import, pero posible.

El fichero contents enumera los ficheros que van en el subdirectorio, junto con posibles indicaciones del bundle en el que deben ir.

Los bundles son agrupaciones de ficheros dentro del item, que separan los diversos tipos de ficheros de modo que DSpace pueda tratarlos de forma diferenciada. Los bundles más habituales son ORIGINAL, LICENSE, LICENSE_CC y THUMBNAIL de contenido obvio, pero pueden aparecer otros bundles como METADATA, ORE y TXT y seguro que me dejo alguno. De hecho, si en el fichero Contents se nombra un nuevo bundle, DSpace creará el objeto con el fichero correspondiente incluido en ese bundle. Queda luego la tarea de modificar DSpace para que incorpore tratamientos diferenciados a los ficheros del nuevo bundle así creado…porque, claro está, el usuario con permisos normales de DSPACE solo podrá ver los ficheros contenidos en el bundle ORIGINAL.

Un ejemplo de Contents (por ahí en medio hay tabuladores, ya que el fichero content está delimitado con tabuladores)

license.txt     bundle:LICENSE
Fichero1.pdf   bundle:ORIGINAL
Fichero2.pdf   bundle:ORIGINAL


A su vez el dublin_core.xml será algo similar a…

<dcvalue element="contributor" qualifier="author">Nombre</dcvalue>
<dcvalue element="language" qualifier="iso">es_ES</dcvalue>
<dcvalue element="title" qualifier="none">Título</dcvalue>

Bien, pues una vez tengamos esta super-estructura formada llega el momento de pelearse con el comando import. Pero eso es otra historia.


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