From db79960ba168724388737015b1801847607d423b Mon Sep 17 00:00:00 2001
From: "Gerber, Mike" <mike.gerber@sbb.spk-berlin.de>
Date: Thu, 7 Apr 2022 16:22:41 +0200
Subject: [PATCH] =?UTF-8?q?=E2=9C=A8=20Force=20singleton=20for=20shelfLoca?=
 =?UTF-8?q?tor?=
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Very few input sources contain multiple mods:shelfLocator elements
for a mods:Location (illegal according to DFG MODS Anwendungsprofil).
Force a singleton in this case.

Fixes gh-7.
---
 qurator/modstool/modstool.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/qurator/modstool/modstool.py b/qurator/modstool/modstool.py
index e469146..a4fed55 100755
--- a/qurator/modstool/modstool.py
+++ b/qurator/modstool/modstool.py
@@ -233,7 +233,7 @@ def mods_to_dict(mods, raise_errors=True):
                 return shelf_locator.get('displayLabel') is None
             value['shelfLocator'] = TagGroup(tag, group) \
                 .filter(no_display_label) \
-                .is_singleton() \
+                .force_singleton() \
                 .has_no_attributes() \
                 .text()
         elif tag == '{http://www.loc.gov/mods/v3}originInfo':