Remove unused function.

Replace constants with variables.

src/main/kotlin/helpers/Extract.kt

@@ -21,7 +21,6 @@ package org.memobase.helpers
 import com.beust.klaxon.JsonArray
 import com.beust.klaxon.JsonObject
 import org.apache.logging.log4j.LogManager
-import org.memobase.model.FacetContainer
 import org.memobase.model.LanguageContainer
 
 object Extract {
@@ -86,24 +85,13 @@ object Extract {
         annotationField: String
     ): List<LanguageContainer> {
         return entities.filter { it[field] == type }.flatMap {
-            languageContainer(it["@id"] as String, it[annotationField])
-        }
-    }
-
-    fun facetEntity(entities: List<JsonObject>, property: String): List<FacetContainer> {
-        return entities.mapNotNull {
-            val lang = languageContainer(it["@id"] as String, it[property])
-            if (lang.isEmpty()) {
-                null
-            } else {
-                FacetContainer(lang.first(), null, lang.first().toList())
-            }
+            languageContainer(it[KEYS.atType] as String, it[annotationField])
         }
     }
 
     fun extractIdValue(entities: List<JsonObject>, type: String): String? {
         return entities.first {
-            it["type"].let { identifier ->
+            it[KEYS.ricoType].let { identifier ->
                 if (identifier == null)
                     false
                 else
@@ -131,12 +119,12 @@ object Extract {
     fun identifiers(value: Any?): List<String> {
         return when (value) {
             is String -> listOf(value)
-            is JsonObject -> value["@id"].let { if (it is String) listOf(it) else emptyList() }
+            is JsonObject -> value[KEYS.atType].let { if (it is String) listOf(it) else emptyList() }
             is JsonArray<*> ->
                 value.mapNotNull { item ->
                     when (item) {
                         is String -> item
-                        is JsonObject -> value["@id"].let { id: Any? ->
+                        is JsonObject -> value[KEYS.atType].let { id: Any? ->
                             if (id is String)
                                 id
                             else null