From ed1eb0c763a62b06719a7ca9e0b5f4b9bc6d964e Mon Sep 17 00:00:00 2001
From: Dan Scott <dscott@laurentian.ca>
Date: Mon, 15 Dec 2014 23:29:35 -0500
Subject: [PATCH] Add the ability to link to sameAs and exampleOfWork entities

Look for standard identifiers with known URIs, such as
LCCNs, OCLC numbers, and URIs identified in 024 fields,
and add http://schema.org/sameAs or
http://schema.org/exampleOfWork properties to the record.
This helps us link out to the broader linked data world,
and should help those consuming our data to better
understand what resources we have to offer.

Signed-off-by: Dan Scott <dscott@laurentian.ca>
---
 Open-ILS/src/templates/opac/parts/misc_util.tt2   | 36 +++++++++++++++++++++++
 Open-ILS/src/templates/opac/parts/record/body.tt2 |  6 ++++
 2 files changed, 42 insertions(+)

diff --git a/Open-ILS/src/templates/opac/parts/misc_util.tt2 b/Open-ILS/src/templates/opac/parts/misc_util.tt2
index 6788c75ced..01e2a580e3 100644
--- a/Open-ILS/src/templates/opac/parts/misc_util.tt2
+++ b/Open-ILS/src/templates/opac/parts/misc_util.tt2
@@ -143,6 +143,42 @@
         END;
         args.upc = args.upcs.0; # use first UPC as the default
 
+        # These are URIs that link out to related works for linked data purposes,
+        # such as OCLC Work Entities like http://worldcat.org/entity/work/id/415491
+
+        # We differentiate between http://schema.org/sameAs relations, which
+        # are roughly the same as the work we're describing here, and
+        # http://schema.org/exampleOfWork which point to a broader work, of which
+        # this is a more specific edition or manifestation.
+        args.links.sameAs = [];
+        args.links.exampleOfWork = [];
+        FOR link_node IN xml.findnodes('//*[@tag="024"]/*[@code="2" and text()="uri"]');
+            my_parent = link_node.parentNode();
+            FOR link IN my_parent.findnodes('./*[@code="a"]');
+                link_uri = link.textContent | trim;
+                IF link_uri.search('worldcat.org/entity/work');
+                    args.links.exampleOfWork.push(link_uri);
+                ELSE;
+                    args.links.sameAs.push(link_uri);
+                END;
+            END;
+        END;
+        FOR lccn IN xml.findnodes('//*[@tag="010"]/*[@code="a"]');
+            lccn_num = lccn.textContent | trim;
+            args.links.sameAs.push('http://lccn.loc.gov/' _ lccn_num);
+        END;
+        FOR oclcnum IN xml.findnodes('//*[@tag="035"]/*[@code="a"]');
+            oclcnum = oclcnum.textContent | trim;
+            NEXT UNLESS oclcnum.search('^\(OCoLC\)');
+            oclcnum = oclcnum | remove('\(OCoLC\)');
+            # These prefixes are often included in the 035, even though they should not be
+            oclcnum = oclcnum | remove('ocm');
+            oclcnum = oclcnum | remove('ocn');
+            oclcnum = oclcnum | remove('on') | trim;
+            args.links.sameAs.push('http://www.worldcat.org/oclc/' _ oclcnum);
+        END;
+        args.links.sameAs = args.links.sameAs.unique;
+
         args.issns = [];
         FOR sub IN xml.findnodes('//*[@tag="022"]/*[@code="a"]');
             args.issns.push(sub.textContent);
diff --git a/Open-ILS/src/templates/opac/parts/record/body.tt2 b/Open-ILS/src/templates/opac/parts/record/body.tt2
index 216f8f96ed..616ede0f15 100644
--- a/Open-ILS/src/templates/opac/parts/record/body.tt2
+++ b/Open-ILS/src/templates/opac/parts/record/body.tt2
@@ -5,6 +5,12 @@
     ctx.record_attrs = attrs; # capture for JS
 %]
 <div id='canvas_main' class='canvas' vocab="http://schema.org/" typeof='[% args.schema.itemtype %] Product' resource="#schemarecord">
+[%- FOREACH link IN args.links.sameAs; %]
+    <link property="sameAs" href="[% link %]">
+[%- END; %]
+[%- FOREACH link IN args.links.exampleOfWork; %]
+    <link property="exampleOfWork" href="[% link %]">
+[%- END; %]
     [%- INCLUDE "opac/parts/record/navigation.tt2" %]
     [%- IF ctx.bib_is_dead %]
     <div id='rdetail_deleted_exp'>
-- 
2.11.0