=== modified file 'modules/taxonomy/taxonomy.install'
--- modules/taxonomy/taxonomy.install	2009-06-12 13:59:56 +0000
+++ modules/taxonomy/taxonomy.install	2009-06-13 19:42:46 +0000
@@ -12,6 +12,26 @@
 function taxonomy_install() {
   // Create tables.
   drupal_install_schema('taxonomy');
+
+  // Create term_concept_uri field.
+  $field = array(
+    'field_name' => 'term_concept_uri',
+    'type' => 'text',
+  );
+  field_create_field($field);
+
+  $instance = array(
+    'field_name' => 'term_concept_uri',
+    'bundle' => 'tags',
+    'label' => t('Concept URI'),
+    'description' => t('URI of the concept this term represents'),
+    'weight' => 0,
+    'widget' => array(
+      'type' => 'text_textfield',
+      'label' => t('Concept URI'),
+    ),
+  );
+  field_create_instance($instance);
 }
 
 /**
@@ -24,6 +44,9 @@
   // Remove variables.
   variable_del('taxonomy_override_selector');
   variable_del('taxonomy_terms_per_page_admin');
+  
+  // Remove fields.
+  field_delete_instance('term_concept_uri', 'tags');
 }
 
 /**