linked-data

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=== Documentation ===
Here, you can find more in-depth information. Please see also our [[FAQ EN|FAQ]].

== The URIs ==
To make data linkable, the described resources, as well as the vocabularies to describe them, have to be unique world-wide. To achieve this, they are denoted with so called Uniform Resource Identifiers (URIs).

As the Mannheim University Library provides data by means of this service, that are not originally created by the library, but are not yet provided with a world-wide unique URI, we decided to assign URIs from the libraries namespace to them. Should the data be available with other URIs later on, it is easy to provide a link between the different URIs.

Currently, we assign the following URIs:

^ URI ^ Description ^
| http://data.bib.uni-mannheim.de/data/swb/<PPN> | Bibliograhic data of the [[http://swb.bsz-bw.de|Südwestdeutscher Bibliotheksverbund]] (SWB), <PPN> is the internal identifier of the SWB. |
| http://data.bib.uni-mannheim.de/data/hebis/<PPN> | Bibliographic data of the  [[http://www.hebis.de|Hessisches Bibliotheksinformationssystem]] (HeBIS), <PPN> is the internal identifier of HeBIS. |
| http://data.bib.uni-mannheim.de/data/rvk/<NOTATION> | Classifications of the [[http://rvk.uni-regensburg.de/|Regensburger Verbundklassifikation]] (RVK). <NOTATION> is the RVK notation, the space is replaced by a _ (e.g. FB_1575). |
|http://data.bib.uni-mannheim.de/data/hbz/<NOTATION> | Bibliographic data of the  [[http://www.hbz-nrw.de/|Hochschulbibliothekszentrum des Landes Nordrhein-Westfalen]] (HBZ), <PPN> is the internal identifier of HBZ.|

Remark: The URIs are used to unambiguously identify the records. Additional data is currently only provided for SWB URIs, that belong to the inventory of the Mannheim University Library. 

== The description of the resources ==
To provide linked data, firstly, the data is filtered and processed. Empty fields are filled or complemented by corresponding field in a superordinate record, if available. To describe the data, we use elements from different vocabularies: [[http://www.dublincore.org/|Dublin Core]] (Prefix dc:), the preliminary version of [[http://metadataregistry.org/schema/show/id/25.html|ISBD]] (Prefix isbd:), our own vocabulary (Prefix ubma:) and RDF Schema (Prefix rdfs:).

The following data is represented in RDF:

^ URI ^ Label ^ Description ^ Remark ^
| dc:title | Title | Name of the Ressource | Main title plus additional title |
| dc:creator | Creator | An entity primarily responsible for making the resource. | Authors in the format "Lastname, Firstname" or name of a corporate body. |
| dc:contributor | Contributor | An entity responsible for making contributions to the resource. | Further contributors, like editors,  in the format "Lastname, Firstname" or name of a corporate body. |
| dc:date | Date | A point or period of time associated with an event in the lifecycle of the resource. | Year of publication |
| dc:publisher | Publisher | An entity responsible for making the resource available. | Publisher |
| isbd:1008 | has edition statement  | Relates a Resource to a word or phrase, or a group of characters, indicating that the resource belongs to an edition.  | Information about the edition. |
| dc:identifier | Identifier | An unambiguous reference to the resource within a given context. | ISBN as URI: ''uri:ISBN:<ISBN>'' |
| dc:language | Language | A language of the resource. | Language, format ISO 639-2 (B) |
| dc:subject | Subject | The topic of the resource. | Subject headings of SWD with DNB URI, Classifications of RVK with URI of the Mannheim University Library (see above). |
| rdfs:seeAlso | See also | Further information | Links to other linked data services, currently to the [[http://www4.wiwiss.fu-berlin.de/bizer/bookmashup/|Book Mashup Service]] of the FU Berlin. |
| ubma:equalsForClassification | Other edition | Other edition, based on an automatic approach | This is the result of a project of the library, that can be reused by means of this service. |
== Datasets ==
Currently, we have loaded about **22 million title records** from the SWB and HeBIS catalogs, as well as about **2.3 million title records** from the library catalog of USB Cologne. The Cologne data originates from the [[http://www.hbz-nrw.de/projekte/linked_open_data/index_html|Open Data Initiative]] of the HBZ.

For experiments, we provide a prototypical version of the [[http://rvk.uni-regensburg.de/|Regensburger Verbundklassifikation]]. **All Classes of the RVK** are loaded and described by means of the [[http://www.w3.org/2004/02/skos/|SKOS vocabulary]].

One of our goals regarding linked data is the provision of project results for easy reuse.

An example for such a project is the aggregation of titles, also across the borders of different catalogs, which can be considered as equal regarding their classification. That means especially the different editions of the titles. 
We provide these relations via the property ubma:equalsForClassification.