add explanatory code comment

intranda · Aug 10, 2023 · aafe94e · aafe94e
1 parent 5a9de0d
commit aafe94e
Showing 1 changed file with 3 additions and 1 deletion.
diff --git a/plugin/src/de/intranda/goobi/plugins/SruOpacImport.java b/plugin/src/de/intranda/goobi/plugins/SruOpacImport.java
@@ -720,7 +720,9 @@ protected String getMappedDocStructType(Map<String, String> mappings, Document d
         for (String xpath : mappings.keySet()) {
 
             XPathExpression<Element> expr;
-            if(ns != null && StringUtils.isBlank(ns.getPrefix())) {          
+            if(ns != null && StringUtils.isBlank(ns.getPrefix())) {        
+                //always provide a namespace with prefix. A namespace with no prefix is not allowed by jdom2 xpath
+                //and no namespace declaration does not match any nodes which have a namespace, even in that namespace does not have a prefix
                 Namespace ns2 = Namespace.getNamespace("marc", ns.getURI());
                 expr = XPathFactory.instance().compile(xpath, Filters.element(), null, ns2);
             } else {