From 3b21673cc9eb03e780e9a19ea769b3b1bcd7a64d Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Gabriele=20H=C3=B6fler?= <gabriele.hoefler@onb.ac.at>
Date: Fri, 7 Jun 2019 14:24:48 +0200
Subject: [PATCH] onbsru: More inline-documentation

---
 sru/onbsru.py | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/sru/onbsru.py b/sru/onbsru.py
index f9f34be..335b38b 100644
--- a/sru/onbsru.py
+++ b/sru/onbsru.py
@@ -14,12 +14,17 @@ class OnbRecordRetriever(almasru.RecordRetriever):
                  xml_format: str = 'marcxml'):
         super().__init__(subdomain, inst_code, xml_format)
 
+    # Create alias for querying AC-numbers
     def by_ac_num(self, ac_num: str):
         return self.by_marc_009(ac_num)
 
-    def get_pids_for_ac(self, ac_num: str):
+    def get_pids_for_ac(self, ac_num: str) -> list:
         """
         Extract all PIDs from XML based on MARC 856 4 2.
+        PIDs are identifiers migrated from a legacy system.
+
+        :param ac_num: ID used in Austrian Library Network
+        :return: List of identifiers.
         """
 
         namespaces = {
-- 
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