Fix multiple qualifiers & certainties.

src/main/kotlin/builders/DateContainerBuilder.kt

 package org.memobase.builders
 
+import com.beust.klaxon.JsonArray
 import com.beust.klaxon.JsonObject
 import org.apache.logging.log4j.LogManager
 import org.memobase.KEYS
@@ -32,8 +33,16 @@ class DateContainerBuilder(private val containedIds: List<String>) : IFieldBuild
         } else {
             null
         }
-        val qualifier = jsonObject["dateQualifier"] as String?
-        val certainty = jsonObject["certainty"] as String?
+        val qualifier = when (val value = jsonObject["dateQualifier"]) {
+            is String -> listOf(value)
+            is JsonArray<*> -> value.mapNotNull { value as String? }
+            else -> emptyList()
+        }
+        val certainty = when (val value = jsonObject["certainty"]) {
+            is String -> listOf(value)
+            is JsonArray<*> -> value.mapNotNull { value as String? }
+            else -> emptyList()
+        }
         val facetList = when (jsonObject["@type"] as String) {
             NS.rico + "SingleDate" ->
                 if (isNormalized)

src/main/kotlin/model/DateContainer.kt

@@ -24,7 +24,7 @@ import com.fasterxml.jackson.annotation.JsonInclude
 data class DateContainer(
     val date: String,
     val sort: String?,
-    val certainty: String?,
-    val qualifier: String?,
+    val certainty: List<String>,
+    val qualifier: List<String>,
     val facet: List<String>
 )