Hi all,
I'm interested in extending existing filters to extract license
metadata. The attached patch demonstrates extracting Creative Commons
license metadata from SVGs, XMP embedded in images and PDFs, and OLE files.
However, I don't know what to do with the licenses extracted. Does a
new property need to be added? How do I get the license back out after
indexing a file with a license?
Thanks,
Jason
Index: Util/F-Spot/MetadataStore.cs
===================================================================
--- Util/F-Spot/MetadataStore.cs (revision 3791)
+++ Util/F-Spot/MetadataStore.cs (working copy)
@@ -198,6 +198,7 @@
public const string RdfsNS =
"http://www.w3.org/2000/01/rdf-schema#";;
public const string IViewNS =
"http://ns.iview-multimedia.com/mediapro/1.0/";;
public const string XmlNS =
"http://iptc.org/std/Iptc4xmpCore/1.0/xmlns/";;
+ public const string CcNS = "http://creativecommons.org/ns#";;
// FIXME this needs to be parsable by System.Uri
public const string FSpotXMPBase =
"http://fakebase.f-spot.org/internal/";;
@@ -219,6 +220,7 @@
Namespaces.AddNamespace (RdfNS, "rdf");
Namespaces.AddNamespace (RdfsNS, "rdfs");
Namespaces.AddNamespace (IViewNS, "mediapro");
+ Namespaces.AddNamespace (CcNS, "cc");
}
public static MetadataStore Descriptions {
Index: Filters/FilterPdf.cs
===================================================================
--- Filters/FilterPdf.cs (revision 3791)
+++ Filters/FilterPdf.cs (working copy)
@@ -13,7 +13,10 @@
using Beagle.Util;
using Beagle.Daemon;
+using Beagle.Util.Xmp;
+using SemWeb;
+
namespace Beagle.Filters {
public class FilterPdf : Beagle.Daemon.Filter {
@@ -39,7 +42,7 @@
{
// create new external process
pc = new SafeProcess ();
- pc.Arguments = new string [] { "pdfinfo",
FileInfo.FullName };
+ pc.Arguments = new string [] { "pdfinfo", "-meta",
FileInfo.FullName };
pc.RedirectStandardOutput = true;
// See FIXME below for why this is false.
pc.RedirectStandardError = false;
@@ -86,6 +89,11 @@
case "Producer":
strMetaTag = "dc:appname";
break;
+ case "Metadata":
+ string xmpString =
pout.ReadToEnd();
+ XmpFile xmp = new XmpFile (new
MemoryStream(System.Text.Encoding.ASCII.GetBytes(xmpString)));
+ AddXmpProperties(xmp);
+ break;
}
if (strMetaTag != null) {
if (bKeyword)
@@ -196,6 +204,49 @@
#endif
pc.Close ();
}
+
+ internal void AddXmpProperties (XmpFile xmp)
+ {
+ Resource subject_anon = null;
+ Resource creator_anon = null;
+ Resource rights_anon = null;
+ Resource title_anon = null;
+
+ foreach (Statement stmt in xmp.Store) {
+ if (stmt.Predicate ==
MetadataStore.Namespaces.Resolve ("dc:subject")) {
+ //Console.WriteLine ("found subject");
+ subject_anon = stmt.Object;
+ } else if (stmt.Predicate ==
MetadataStore.Namespaces.Resolve ("dc:creator")) {
+ //Console.WriteLine ("found creator");
+ creator_anon = stmt.Object;
+ } else if (stmt.Predicate ==
MetadataStore.Namespaces.Resolve ("dc:rights")) {
+ rights_anon = stmt.Object;
+ } else if (stmt.Predicate ==
MetadataStore.Namespaces.Resolve ("dc:title")) {
+ if (stmt.Object is Literal)
+ AddProperty
(Beagle.Property.New ("dc:title", ((Literal)stmt.Object).Value));
+ else if (stmt.Object is BNode)
+ title_anon = stmt.Object;
+ } else if (stmt.Predicate ==
MetadataStore.Namespaces.Resolve ("cc:license")) {
+ AddProperty (Beagle.Property.NewKeyword
("fixme:license", ((Literal)stmt.Object).Value));
+ }
+ }
+
+ foreach (Statement stmt in xmp.Store) {
+ if (stmt.Subject == subject_anon &&
+ stmt.Predicate !=
MetadataStore.Namespaces.Resolve ("rdf:type")) {
+ AddProperty (Beagle.Property.New
("dc:subject", ((Literal)stmt.Object).Value));
+ } else if (stmt.Subject == creator_anon &&
+ stmt.Predicate !=
MetadataStore.Namespaces.Resolve ("rdf:type")) {
+ AddProperty (Beagle.Property.New
("dc:creator", ((Literal)stmt.Object).Value));
+ } else if (stmt.Subject == rights_anon &&
+ stmt.Predicate !=
MetadataStore.Namespaces.Resolve ("rdf:type")) {
+ AddProperty (Beagle.Property.New
("dc:rights", ((Literal)stmt.Object).Value));
+ } else if (stmt.Subject == title_anon &&
+ stmt.Predicate !=
MetadataStore.Namespaces.Resolve ("rdf:type")) {
+ AddProperty (Beagle.Property.New
("dc:title", ((Literal)stmt.Object).Value));
+ }
+ }
+ }
}
}
Index: Filters/FilterOle.cs
===================================================================
--- Filters/FilterOle.cs (revision 3791)
+++ Filters/FilterOle.cs (working copy)
@@ -141,6 +141,10 @@
prop = docSumMeta.Lookup ("gsf:category");
if (prop != null)
AddProperty (Beagle.Property.New
("fixme:category", prop.Val as string));
+
+ prop = docSumMeta.Lookup
("CreativeCommons_LicenseURL");
+ if (prop != null)
+ AddProperty (Beagle.Property.New
("fixme:license", prop.Val as string));
}
ExtractMetaData (sum_stream, doc_stream);
Index: Filters/FilterImage.cs
===================================================================
--- Filters/FilterImage.cs (revision 3791)
+++ Filters/FilterImage.cs (working copy)
@@ -157,6 +157,8 @@
} else if (stmt.Predicate ==
MetadataStore.Namespaces.Resolve ("tiff:Model")) {
// NOTE: the namespaces for xmp and
beagle don't always match up
AddProperty (Beagle.Property.New
("exif:Model", ((Literal)stmt.Object).Value));
+ } else if (stmt.Predicate ==
MetadataStore.Namespaces.Resolve ("cc:license")) {
+ AddProperty (Beagle.Property.NewKeyword
("fixme:license", ((Literal)stmt.Object).Value));
}
}
Index: Filters/FilterSvg.cs
===================================================================
--- Filters/FilterSvg.cs (revision 3791)
+++ Filters/FilterSvg.cs (working copy)
@@ -41,6 +41,7 @@
static private string [] ignore_strings = { "format"};
static private string dcnamespace =
"http://purl.org/dc/elements/1.1/";;
+ static private string ccnamespace =
"http://creativecommons.org/ns#";;
public FilterSvg ()
{
@@ -154,8 +155,14 @@
if (grab_text)
break;
- if
(reader.IsEmptyElement)
+ if
(reader.IsEmptyElement) {
+ if
(reader.NamespaceURI == ccnamespace) {
+ if (
reader.LocalName == "license" ) {
+
AddProperty (Property.NewKeyword ("fixme:license",
reader.GetAttribute("resource","http://www.w3.org/1999/02/22-rdf-syntax-ns#";)));
+ }
+ }
break;
+ }
if
(ArrayFu.IndexOfString (ignore_strings, reader.LocalName) != -1)
break;
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