✨ Count all alto:String elements with TAGREFS attribute

qurator/modstool/alto4pandas.py

@@ -83,6 +83,9 @@ def alto_to_dict(alto, raise_errors=True):
             value[localname].update(TagGroup(tag, group).subelement_counts())
             value[localname].update(TagGroup(tag, group).xpath_statistics("//alto:String/@WC", namespaces))
 
+            # Count all alto:String elements with TAGREFS attribute
+            value[localname].update(TagGroup(tag, group).xpath_count("//alto:String[@TAGREFS]", namespaces))
+
         elif localname == 'Styles':
             pass
         elif localname == 'Tags':

qurator/modstool/lib.py

@@ -229,6 +229,17 @@ class TagGroup:
             statistics[f'{xpath_expr}-max'] = np.max(values)
         return statistics
 
+    def xpath_count(self, xpath_expr, namespaces):
+        """
+        Count all elements matching xpath_expr
+        """
+        values = []
+        for e in self.group:
+            r = e.xpath(xpath_expr, namespaces=namespaces)
+            values += r
+
+        counts = {f'{xpath_expr}-count': len(values)}
+        return counts
 
 
 

qurator/modstool/tests/test_alto.py

@@ -55,3 +55,27 @@ def test_Tags_counts():
     </alto>
     """)
     assert d['Tags_NamedEntityTag-count'] == 9
+
+def test_String_TAGREF_counts():
+    d = dict_fromstring("""
+    <alto xmlns="http://www.loc.gov/standards/alto/ns-v2#">
+      <Layout>
+      <Page>
+      <PrintSpace>
+      <TextBlock>
+        <TextLine>
+          <String CONTENT="Pentlings" HEIGHT="33" HPOS="330" TAGREFS="PER0" VPOS="699" WC="0.4511111081" WIDTH="146"/>
+        </TextLine>
+        <TextLine>
+          <String CONTENT="Pentlings" HEIGHT="33" HPOS="330" TAGREFS="PER0" VPOS="699" WC="0.4511111081" WIDTH="146"/>
+          <String CONTENT="Pentlings" HEIGHT="33" HPOS="330" TAGREFS="PER0" VPOS="699" WC="0.4511111081" WIDTH="146"/>
+          <String CONTENT="No TAGREF!" />
+        </TextLine>
+      </TextBlock>
+      </PrintSpace>
+      </Page>
+      </Layout>
+    </alto>
+    """)
+    assert d['Layout_Page_//alto:String[@TAGREFS]-count'] == 3
+    assert d['Layout_Page_String-count'] == 4