minor error handling improvements

csvwlib/converter/ModelConverter.py

@@ -75,7 +75,7 @@ def _add_table_metadata(table_metadata, table):
     def _normalize_metadata_base_url(self):
         if self.metadata is None:
             return
-        for context_entry in self.metadata['@context']:
+        for context_entry in self.metadata.get('@context',[]):
             if type(context_entry) is dict and '@base' in context_entry:
                 original_url = self.metadata['url']
                 if original_url.startswith('http'):

csvwlib/converter/ToRDFConverter.py

@@ -78,7 +78,7 @@ def parse_virtual_columns(self, row_node, atdm_row, table_metadata):
                 self.graph.add((row_node, CSVW.describes, subject))
 
     def _add_file_metadata(self, metadata, node):
-        language = JSONLDUtils.language(self.metadata['@context'])
+        language = JSONLDUtils.language(self.metadata.get('@context',[]))
         for key, value in metadata.items():
             if CommonProperties.is_common_property(key) or key == 'notes':
                 triples = CommonProperties.property_to_triples((key, metadata[key]), node, language)

csvwlib/utils/json/CommonProperties.py

@@ -80,9 +80,17 @@ def expand_property_if_possible(prop):
             return prop
 
         prefix, prop = prop.split(':')
-        return Namespaces.get(prefix).term(prop)
+        return CommonProperties.ns_has_term(prefix, prop)
 
     @staticmethod
     def expand_property(prop):
         prefix, prop = prop.split(':')
-        return Namespaces.get(prefix).term(prop)
+        return CommonProperties.ns_has_term(prefix, prop)
+
+    @staticmethod
+    def ns_has_term(prefix, prop):
+        pf = Namespaces.get(prefix)
+        if pf:
+            return pf.term(prop)
+        else:
+            raise Exception(f'Namespace {prefix} for {prop} not registered')

csvwlib/utils/rdf/OntologyUtils.py

@@ -21,4 +21,5 @@ def type(column_metadata):
             return None
 
         datatype = OntologyUtils._name_mappings.get(datatype, datatype)
-        return OntologyUtils._type_mappings.get(datatype, XSD.term(datatype))
+        xsd_type = getattr(XSD, datatype)
+        return OntologyUtils._type_mappings.get(datatype, xsd_type)

csvwlib/utils/url/UriTemplateUtils.py

@@ -27,7 +27,6 @@ def expand_template(template: str, row: dict) -> str:
         """
         def replacer(match):
             var = match.group(1)
-            print('r',row)
             if var in row.keys():
                 return str(row[var])
             raise KeyError(f"Missing value for template variable '{var}'")