diff --git a/src/NodaValidationHelper.php b/src/NodaValidationHelper.php
index b1e74fd..75965f3 100644
--- a/src/NodaValidationHelper.php
+++ b/src/NodaValidationHelper.php
@@ -120,4 +120,93 @@ final class NodaValidationHelper {
         }
 
     }
+
+    /**
+     * Checks if an actor name is valid.
+     * Returns 0 if the actor can be added as a new one / actor name can be used as a new one.
+     * Returns the ID for already known actors.
+     * Throws an exception if the actor is blacklisted.
+     *
+     * @param MDMysqli $mysqli_noda          DB connection to vocabulary.
+     * @param string   $lang                 User language.
+     * @param string   $persinst_name        Actor name.
+     * @param string   $persinst_name_en     Actor name (short).
+     * @param string   $persinst_geburtsjahr Birth year.
+     * @param string   $persinst_sterbejahr  Death year.
+     * @param string   $context_identifier   Context / instance identifier.
+     * @param integer  $institution_id       Institution ID.
+     *
+     * @return integer
+     */
+    public static function checkPersinstNameIsUsable(MDMysqli $mysqli_noda, string $lang, string $persinst_name, string $persinst_name_en, string $persinst_geburtsjahr, string $persinst_sterbejahr, string $context_identifier, int $institution_id):int {
+
+        if ($storedType = NodaDistinctlyTypedStrings::lookup($mysqli_noda, $lang, $persinst_name_en)) {
+
+            if ($storedType !== 'persinst') {
+                throw new MDpageParameterMissingException("This term is marked to be distinctly a " . $storedType);
+            }
+
+        }
+
+        // Special case: ? or "unbekannt" as a given name.
+        if (str_starts_with($persinst_name_en, '? ') || str_starts_with(strtolower($persinst_name_en), 'unbekannt ') ) {
+            throw new MDBlacklistedInputException("Term is blacklisted");
+        }
+
+        // Check if the place name is in the current language's blacklist.
+        if (NodaBlacklistedTerms::checkPersinstBlacklistedInDb($mysqli_noda, $lang, $persinst_name) === true) {
+            throw new MDBlacklistedInputException("Term is blacklisted");
+        }
+        if (NodaBlacklistedTerms::checkPersinstBlacklistedInDb($mysqli_noda, $lang, $persinst_name_en) === true) {
+            throw new MDBlacklistedInputException("Term is blacklisted");
+        }
+
+        if ($existingPersinstId = NodaIDGetter::getPersinstIDByNamesAndRewrites($mysqli_noda, $lang, $persinst_name_en, $persinst_geburtsjahr, $persinst_sterbejahr, $context_identifier, $institution_id)) {
+            return $existingPersinstId;
+        }
+
+        if ($existingPersinstId = NodaIDGetter::getPersinstIDByNamesAndRewrites($mysqli_noda, $lang, $persinst_name, $persinst_geburtsjahr, $persinst_sterbejahr, $context_identifier, $institution_id)) {
+            return $existingPersinstId;
+        }
+
+        return 0;
+
+    }
+
+    /**
+     * Checks if an place name is valid.
+     * Returns 0 if the place can be added as a new one / place name can be used as a new one.
+     * Returns the ID for already known places.
+     * Throws an exception if the place is blacklisted.
+     *
+     * @param MDMysqli $mysqli_noda        DB connection to vocabulary.
+     * @param string   $lang               User language.
+     * @param string   $place_name         Place name.
+     * @param string   $context_identifier Context / instance identifier.
+     * @param integer  $institution_id     Institution ID.
+     *
+     * @return integer
+     */
+    public static function checkPlaceNameIsUsable(MDMysqli $mysqli_noda, string $lang, string $place_name, string $context_identifier, int $institution_id):int {
+
+        if ($storedType = NodaDistinctlyTypedStrings::lookup($mysqli_noda, $lang, $place_name)) {
+
+            if ($storedType !== 'orte') {
+                throw new MDpageParameterMissingException("This term is marked to be distinctly a " . $storedType);
+            }
+
+        }
+
+        // Check if the place name is in the current language's blacklist.
+        if (NodaBlacklistedTerms::checkPlaceBlacklistedInDb($mysqli_noda, $lang, $place_name) === true) {
+            throw new MDBlacklistedInputException("Term is blacklisted");
+        }
+
+        if ($existingPlaceId = NodaIDGetter::getPlaceIDByNamesAndRewrites($mysqli_noda, $lang, $place_name, $context_identifier, $institution_id)) {
+            return $existingPlaceId;
+        }
+
+        return 0;
+
+    }
 }