feat: Add link checker for conforms to urls

ckan_pkg_checker/checkers/link_checker.py

@@ -19,13 +19,15 @@
 TEST_QUALIFIED_RELATION_URL = "dcat:qualifiedRelation"
 TEST_LANDING_PAGE_URL = "dcat:landingPage"
 TEST_PUBLISHER_URL = "dct:publisher"
+TEST_CONFORMS_TO_URL = "dct:conformsTo"
 TEST_DOWNLOAD_URL = "dcat:downloadURL"
 link_checks = [
     TEST_ACCESS_URL,
     TEST_RELATION_URL,
     TEST_QUALIFIED_RELATION_URL,
     TEST_LANDING_PAGE_URL,
     TEST_PUBLISHER_URL,
+    TEST_CONFORMS_TO_URL,
     TEST_DOWNLOAD_URL,
 ]
 
@@ -117,6 +119,16 @@ def check_package(self, pkg):
                     if check_result:
                         check_results.append(check_result)
 
+        # Check conforms to URL
+        if "conforms_to" in pkg:
+            for conforms_to_url in pkg["conforms_to"]:
+                if conforms_to_url:
+                    check_result = self._check_url_status(
+                        TEST_CONFORMS_TO_URL, conforms_to_url
+                    )
+                    if check_result:
+                        check_results.append(check_result)
+
         for resource in pkg["resources"]:
             log.info(
                 f"LINKCHECKER: checking RESOURCE: {utils.get_field_in_one_language(resource['display_name'], '')}"