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[FEATURE] Umlauts (e.g., ä → ae), ß (→ ss), and the lang-s (ſ → s) #1971

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[FEATURE] Umlauts (e.g., ä → ae), ß (→ ss), and the lang-s (ſ → s) #1971

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5485ac0
Umlauts (e.g., ä → ae), ß (→ ss), and the long s (ſ → s)
BFallert May 11, 2026
a36b135
Merge branch 'kitodo:main' into feature/UmlautLongS
BFallert May 12, 2026
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8 changes: 8 additions & 0 deletions Configuration/ApacheSolr/configsets/dlf/conf/mapping-UmlautLongS.txt
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Original file line number Diff line number Diff line change
@@ -0,0 +1,8 @@
"ä" => "ae"
"Ä" => "Ae"
"ö" => "oe"
"Ö" => "Oe"
"ü" => "ue"
"Ü" => "Ue"
"ß" => "ss"
"ſ" => "s"
5 changes: 5 additions & 0 deletions Configuration/ApacheSolr/configsets/dlf/conf/schema.xml
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Expand Up @@ -43,16 +43,19 @@ limitations under the License.
<fieldType name="geojson" class="solr.SpatialRecursivePrefixTreeFieldType" spatialContextFactory="Geo3D" geo="true" planetModel="WGS84" format="GeoJSON" />
<fieldType name="standard" class="solr.TextField" positionIncrementGap="100">
<analyzer>
<charFilter class="solr.MappingCharFilterFactory" mapping="mapping-UmlautLongS.txt"/>
<tokenizer class="solr.StandardTokenizerFactory" />
<filter class="solr.LowerCaseFilterFactory" />
</analyzer>
</fieldType>
<fieldType name="autocomplete" class="solr.TextField" positionIncrementGap="100">
<analyzer type="index">
<charFilter class="solr.MappingCharFilterFactory" mapping="mapping-UmlautLongS.txt"/>
<tokenizer class="solr.KeywordTokenizerFactory" />
<filter class="solr.LowerCaseFilterFactory" />
</analyzer>
<analyzer type="query">
<charFilter class="solr.MappingCharFilterFactory" mapping="mapping-UmlautLongS.txt"/>
<tokenizer class="solr.WhitespaceTokenizerFactory" />
<filter class="solr.LowerCaseFilterFactory" />
</analyzer>
Expand All @@ -62,6 +65,7 @@ limitations under the License.
<analyzer type="index">
<!-- For converting OCR to plaintext -->
<charFilter class="solrocr.OcrCharFilterFactory" />
<charFilter class="solr.MappingCharFilterFactory" mapping="mapping-UmlautLongS.txt"/>

<charFilter class="solr.HTMLStripCharFilterFactory" />
<tokenizer class="solr.WhitespaceTokenizerFactory" />
Expand All @@ -81,6 +85,7 @@ limitations under the License.
<!-- TODO: which filters here are the character filters? -->
<!-- TODO: check why some filters are outcommented -->
<analyzer type="query">
<charFilter class="solr.MappingCharFilterFactory" mapping="mapping-UmlautLongS.txt"/>
<tokenizer class="solr.WhitespaceTokenizerFactory" />
<filter class="solr.SynonymGraphFilterFactory" synonyms="synonyms.txt" ignoreCase="true" expand="true" />
<filter class="solr.StopFilterFactory" ignoreCase="true" words="stopwords.txt" />
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