So more into XMP data issues and handling this properly. Parsing the formatted data from ExifTool I realize isn't going to be a reliable method for this system. So this meant having to export the full tag in binary from Exiftool utilizing something like: exiftool -xmp -b sample.jpg > sample.metadata sample image comes from Douglas Hackney (thanks!)
import string, os
from rdflib import ConjunctiveGraph as Graph, Namespace
DC = Namespace("http://purl.org/dc/elements/1.1/")
RDF = Namespace("http://www.w3.org/1999/02/22-rdf-syntax-ns#")
EXIF = Namespace("http://ns.adobe.com/exif/1.0/")
ns = dict(dc=DC, rdf=RDF, exif=EXIF)
g = Graph()
g.parse("sample.metadata", format="xml")
for x in g.query('SELECT ?bExifVersion WHERE {?x exif:ExifVersion ?bExifVersion }',
initNs=ns):
print "Exif Version is: %s" % x
The problem line is the SparQL query which works for ExifVersion because it exists in the primary rdf:Description node and is listed properly in the metadata like exif:ExifVersion but because the Dublin Core Metadata has its own nodes I get blank nodes if I do something like SELECT ?acreator WHERE {?x dc:creator ?acreator }. After validating the metdata via W3.org and getting validation that the rdf is fine I am not sure how to handle this. Is it possible to do sub-queries with SparQL or how does one handle the extra node stuff. Can someone from the w3 comment?
Nevermind: I'm doing it wrong 
Will update this entry when i'm complete.
Christopher Warner is part genius, part idiot. This makes him well balanced. He's worked on numerous opensource projects with great people and has generally led an eventful and fulfilling life. He hopes to retire an old man in a rocking chair should he be so fortunate.
SparQL and subquerying
So more into XMP data issues and handling this properly. Parsing the formatted data from ExifTool I realize isn't going to be a reliable method for this system. So this meant having to export the full tag in binary from Exiftool utilizing something like: exiftool -xmp -b sample.jpg > sample.metadata sample image comes from Douglas Hackney (thanks!)
The problem line is the SparQL query which works for ExifVersion because it exists in the primary rdf:Description node and is listed properly in the metadata like exif:ExifVersion but because the Dublin Core Metadata has its own nodes I get blank nodes if I do something like SELECT ?acreator WHERE {?x dc:creator ?acreator }. After validating the metdata via W3.org and getting validation that the rdf is fine I am not sure how to handle this. Is it possible to do sub-queries with SparQL or how does one handle the extra node stuff. Can someone from the w3 comment?
Nevermind: I'm doing it wrong
Will update this entry when i'm complete.
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About Christopher Warner
Christopher Warner is part genius, part idiot. This makes him well balanced. He's worked on numerous opensource projects with great people and has generally led an eventful and fulfilling life. He hopes to retire an old man in a rocking chair should he be so fortunate.