I’ve been periodically poking at getting Linked Data/RDF views hooked into the World Digital Library web application, following Ed Summerslead from his work on Chronicling America. The RDF views also use the OAI-ORE vocabulary to express aggregations – in WDL, an item is an aggregation of its constituent files. The goal is to provide a semantically rich and holistic representation of a WDL item (identifier, constituent files, metadata, translations, and so on).

The ORE format is a new one for me so it’s hard to say whether the output of my dev branch is valid ORE or not. Plus I’m a sucker for validators. Turns out Rob Sanderson has developed a Python library for validating ORE, and this little snippet is what I’ve been using to validate the ORE. I didn’t put much effort into making it readable, so much as banging something functional out so I can meet deadlines, so mea culpa and all that. But without further hemming and hawing, the code:

# validate.py
import sys
from foresite import *

rem = RdfLibParser().parse(ReMDocument(sys.argv[1]))
aggr = rem.aggregation
n3 = RdfLibSerializer('n3')
rem2 = aggr.register_serialization(n3)
print rem2.get_serialization(n3).data

Most of this code is naively copied and pasted from Rob’s excellent Foresite documentation.

I invoke it thusly: python validate.py {URL}

And the output:

@prefix _27: <http://www.semanticdesktop.org/ontologies/nfo#>.
@prefix _28: <http://localhost/en/item/1/id#>.
@prefix _29: <http://localhost/en/item/1/>.
@prefix bibo: <http://purl.org/ontology/bibo/>.
@prefix dc: <http://purl.org/dc/elements/1.1/>.
@prefix dcterms: <http://purl.org/dc/terms/>.
@prefix ore: <http://www.openarchives.org/ore/terms/>.
@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>.
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#>.
@prefix rdfs1: <http://www.w3.org/2001/01/rdf-schema#>.

 _28:ResourceMap a ore:ResourceMap;
     dc:format "text/rdf+n3";
     dcterms:created "2009-07-31T14:23:31Z";
     dcterms:modified "2009-07-31T14:23:31Z";
     ore:describes _29:id. 

 _29:id a bibo:Image,
         ore:Aggregation;
     dcterms:DDC "973";
     dcterms:alternative "Antietam, Maryland. Allan Pinkerton, President Lincoln, and Major General John A. McClernand"@en;
     dcterms:created "1862年10月3日"@zh,
         "3 de octubre de 1862"@es,
         "3 de outubro de 1862"@pt,
         "3 octobre 1862"@fr,
         "3 октября 1862 года"@ru,
         "October 3, 1862"@en,
         " ٣ آكتوبر، ١٨٦٢"@ar;
     dcterms:creator "Gardner, Alexander"@en,
         "Gardner, Alexander"@es,
         "Gardner, Alexander"@fr,
         "Gardner, Alexander"@pt,
         "Гарднер, Александр"@ru,
         "جاردنر, أليكسندر"@ar,
         "加德纳, 亚历山大"@zh;
... (and so on and so forth)
     dcterms:title "Antietam, Maryland. Allan Pinkerton, President Lincoln, and Major General John A. McClernand: Another View"@en,
         "Antietam, Maryland. Allan Pinkerton, el Presidente Lincoln y el General Principal John A. McClernand: Otra visión"@es,
         "Antietam, Maryland. Allan Pinkerton, le président Lincoln et le général-major John A. McClernand: Autre vue"@fr,
         "Antietam, Maryland. Allan Pinkerton,  Presidente Lincoln e Major-General John A. McClernand: Outra Vista"@pt,
         "Антитэм, штат Мэриленд. Аллан Пинкертон, президент Линкольн и генерал-майор Джон А. Макклернанд: Другой снимок"@ru,
         "أنتينام، ميريلاند ألان بينكرتون، الرئيس لينكولن، واللواء جون أ. ماكليرناند: منظر آخر"@ar,
         "安蒂特姆,马里兰州 艾伦·平克顿、林肯总统和少将约翰·A ·马克克拉南: 另一个视角"@zh;
     ore:aggregates <http://localhost/static/c/1/reference/04326u_thumb_item.gif>,
         <http://localhost/static/c/1/service/04326u.tif>;
     ore:isDescribedBy <http://localhost/en/item/1/item.rdf>;
     rdfs:seeAlso <http://hdl.loc.gov/loc.wdl/dlc.1>. 

 <http://localhost/static/c/1/reference/04326u_thumb_item.gif> a _27:FileDataObject;
     dcterms:format "image/gif";
     _27:fileSize "34531"^^<http://www.w3.org/2001/XMLSchema#long>. 

 <http://localhost/static/c/1/service/04326u.tif> a _27:FileDataObject;
     dcterms:format "image/tiff";
     _27:fileSize "1301614"^^<http://www.w3.org/2001/XMLSchema#long>. 

 ore:Aggregation rdfs1:isDefinedBy <http://www.openarchives.org/ore/terms/>;
     rdfs1:label "Aggregation". 

 ore:ResourceMap rdfs1:isDefinedBy <http://www.openarchives.org/ore/terms/>;
     rdfs1:label "ResourceMap". 

You might pick up on some warts I have yet to fix, but there you go.