diff --git a/dev/xsd_to_edn/main.clj b/dev/xsd_to_edn/main.clj
index d7ea8dc6..86313723 100644
--- a/dev/xsd_to_edn/main.clj
+++ b/dev/xsd_to_edn/main.clj
@@ -69,7 +69,7 @@
   (if (:ref attrs) (assoc attrs :type (name-to-type (:ref attrs)))
                    attrs))
 
-(defn -main [& args]
+(defn process-xsd []
   (let [d (clj-xml/parse-str (subs (slurp "resources/DUO_RIO_Beheren_OnderwijsOrganisatie_V4.xsd") 1)) ; remove BOM with subs
         name-to-type (reduce
                        (fn [h {:keys [attrs]}] (assoc h (:name attrs) (:type attrs)))
@@ -78,13 +78,17 @@
                                      (= "element" (name (:tag %))))
                                (:content d)))
 
-        ;; Parse document, take children, select complexType elements, remove tag names from tuple with tag-name, attributes, children
+        ;; Parse document, take children, select simpleType elements
+        st (map rest (filter #(= "simpleType" (first %))
+                             (last (parse d))))
+
+        ;; Parse document, take children, select complexType elements
         ct (map rest (filter #(= "complexType" (first %))
                              (last (parse d))))
 
         ;; Index by name, remove requests and responses
         entities (into {}
-                       (filter (fn [[k v]]
+                       (filter (fn [[k _v]]
                                  (not (or (str/ends-with? k "_request")
                                           (str/ends-with? k "_response"))))
                                (zipmap (map #(:name (first %)) ct)
@@ -114,4 +118,30 @@
         with-kenmerken (map-hash (fn [[k v]]
                                    [k (merge-kenmerken v (result (str "Kenmerkwaardenbereik_" k)))])
                                  result)]
-    (pprint/pprint (select-keys with-kenmerken interesting-types))))
+    {:interesting-types interesting-types
+     :with-kenmerken with-kenmerken
+     :simple-types st}))
+
+;; A constraint looks like:
+;; ["maxLength" {:value "60"} nil]
+(defn parse-constraint [[name {value :value}]]
+  {(keyword name) (cond-> value (#{"maxLength" "minLength"} name) Integer/parseInt)})
+
+;; A simple-type looks like:
+;;({:name "AangebodenOpleidingExterneIdentificatie-v01"}
+;;  [["restriction"
+;;    {:base "IdentificatiecodeType"}
+;;    [["maxLength" {:value "60"} nil]]]])
+(defn- simple-type-reducer [h [tag [[_name attrs constraints]]]]
+  (let [restrictions (reduce merge {} (map parse-constraint constraints))]
+    (assoc h
+      (-> tag :name)
+      (merge (select-keys attrs [:base])
+             (when-not (empty? restrictions) {:restrictions restrictions})))))
+
+(defn -main [kind & _args]
+  (let [{:keys [:interesting-types :with-kenmerken :simple-types]} (process-xsd)]
+    (pprint/pprint
+      (case kind
+        "schema" (select-keys with-kenmerken interesting-types) ; see resources/beheren-schema.edn
+        "types"  (reduce simple-type-reducer {} simple-types))))) ; see resources/beheren-types.edn
diff --git a/project.clj b/project.clj
index c161d3ee..bcf1f21f 100644
--- a/project.clj
+++ b/project.clj
@@ -62,7 +62,8 @@
                                   ;; This will regenerate `src/nl/surf/eduhub_rio_mapper/enums.clj`
                                   "generate-enums" ["run" "-m" "generate-enums.main"]
                                   ;; Simple prepopulated call to the raadplegen section of the rio test api. Spits out response body to STDOUT.
-                                  "beheren-edn"    ["run" "-m" "xsd-to-edn.main"]
+                                  "beheren-edn"    ["run" "-m" "xsd-to-edn.main" "schema"]
+                                  "types-edn"      ["run" "-m" "xsd-to-edn.main" "types"]
                                   "mapper"         ["run" "-m" "nl.surf.eduhub-rio-mapper.main"]
                                   "proof-specs"    ["run" "-m" "nl.jomco.proof-specs"
                                                     "--verbose"
diff --git a/resources/beheren-types.edn b/resources/beheren-types.edn
new file mode 100644
index 00000000..6e042b48
--- /dev/null
+++ b/resources/beheren-types.edn
@@ -0,0 +1,204 @@
+{"VrijeTekstType" {:base "xsd:string"},
+ "URL"
+ {:base "VrijeTekstType",
+  :restrictions {:minLength 0, :maxLength 320}},
+ "InstroomperiodeCohortbegindatum-v01" {:base "DatumType"},
+ "EisenWerkzaamheden-v01" {:base "WaardenlijstType-v01"},
+ "IdentificatiecodeBedrijfsdocument-v02"
+ {:base "IdentificatiecodeType",
+  :restrictions
+  {:minLength 1, :maxLength 50, :pattern "[A-Za-z0-9_\\-]{1,50}"}},
+ "NLQFniveau-v01"
+ {:base "WaardenlijstType-v01",
+  :restrictions {:minLength 1, :maxLength 2}},
+ "Aanmeldingscohorteinddatum-v01" {:base "DatumType"},
+ "BijzondereInrichtingBo-v01" {:base "WaardenlijstType-v01"},
+ "HuisnummertoevoegingNEN-v02"
+ {:base "VrijeTekstType", :restrictions {:minLength 1, :maxLength 6}},
+ "OpleidingsUUID-v01"
+ {:base "UUIDType", :restrictions {:minLength 36, :maxLength 36}},
+ "DatumTijdBedrijfsdocument" {:base "DatumTijdLangType"},
+ "Cohortbedragsoort-v01"
+ {:base "WaardenlijstType-v01", :restrictions {:maxLength 30}},
+ "Aanmeldingscohortbegindatum-v01" {:base "DatumType"},
+ "LeveringGoedgekeurd" {:base "IndicatorType"},
+ "OpleidingskenmerkcodePedagogischConcept-v03"
+ {:base "WaardenlijstType-v01"},
+ "UitBedrijfdatum-v01" {:base "DatumType"},
+ "Plaatsnaam-v02"
+ {:base "Teksttype", :restrictions {:minLength 1, :maxLength 40}},
+ "OnderwijsbestuurID-v01"
+ {:base "VrijeTekstType",
+  :restrictions
+  {:minLength 7, :maxLength 7, :pattern "(\\d{3}B\\d{3})"}},
+ "Foutcode"
+ {:base "IdentificatiecodeType",
+  :restrictions {:minLength 1, :maxLength 60}},
+ "InstroomperiodeCohorteinddatum-v01" {:base "DatumType"},
+ "Sleutelnaam-v01"
+ {:base "VrijeTekstType", :restrictions {:minLength 1, :maxLength 25}},
+ "EersteInstroomDatum-v01" {:base "DatumType"},
+ "IdentificatiecodeType"
+ {:base "xsd:normalizedString", :restrictions {:minLength 1}},
+ "DeficientieMogelijk-v01" {:base "WaardenlijstType-v01"},
+ "WaardeType" {:base "xsd:decimal"},
+ "Onderwijslocatiegebruikbegindatum-v01" {:base "DatumType"},
+ "OrganisatorischeEenheidnaam-v01"
+ {:base "VrijeTekstType", :restrictions {:minLength 1, :maxLength 80}},
+ "Niveaucode-v06" {:base "WaardenlijstType-v01"},
+ "InternationaleNaam-v01"
+ {:base "VrijeTekstType",
+  :restrictions {:minLength 1, :maxLength 225}},
+ "Postcode-v02"
+ {:base "VrijeTekstType",
+  :restrictions {:maxLength 6, :pattern "([1-9]{1}[0-9]{3}[A-Z]{2})"}},
+ "EQFniveau-v01"
+ {:base "WaardenlijstType-v01",
+  :restrictions {:minLength 1, :maxLength 1}},
+ "OnderwijslocatiegebruikExterneIdentificatie-v01"
+ {:base "IdentificatiecodeType", :restrictions {:maxLength 60}},
+ "PositiefBedrag-v01"
+ {:base "WaardeType",
+  :restrictions
+  {:minInclusive 0, :maxInclusive 1000000, :fractionDigits 2}},
+ "DatumType" {:base "xsd:date"},
+ "DatumTijdLangType" {:base "xsd:dateTime"},
+ "Kwalificatieniveau-v03" {:base "WaardenlijstType-v01"},
+ "LeertrajectMBO-v02" {:base "WaardenlijstType-v01"},
+ "ISCED-v01"
+ {:base "NummerKortType",
+  :restrictions {:minInclusive 0, :maxInclusive 999}},
+ "InBedrijfdatum-v01" {:base "DatumType"},
+ "KenmerkwaardeDatum-v01" {:base "DatumType"},
+ "OnderwijsaanbiederID-v01"
+ {:base "VrijeTekstType",
+  :restrictions
+  {:minLength 7, :maxLength 7, :pattern "(\\d{3}A\\d{3})"}},
+ "OpleidingseenheidID-v01"
+ {:base "Teksttype",
+  :restrictions
+  {:minLength 9, :maxLength 9, :pattern "(\\d{4}O\\d{4})"}},
+ "Opleidingcode"
+ {:base "VrijeTekstType", :restrictions {:minLength 1, :maxLength 8}},
+ "PeriodeEinddatum-v01" {:base "DatumType"},
+ "OmschrijvingBuitenlandsePartner-v01"
+ {:base "VrijeTekstType", :restrictions {:maxLength 250}},
+ "OpleidingskenmerkcodeAangebodenVoOpleiding-v01"
+ {:base "WaardenlijstType-v01"},
+ "Latitude-v01"
+ {:base "WaardeType",
+  :restrictions
+  {:minInclusive -90, :maxInclusive 90, :fractionDigits 8}},
+ "NaamOpleidingLang"
+ {:base "Teksttype", :restrictions {:minLength 1, :maxLength 225}},
+ "Kenmerknaam-v01"
+ {:base "VrijeTekstType", :restrictions {:minLength 1, :maxLength 50}},
+ "Huisnummer-v03"
+ {:base "NummerType",
+  :restrictions {:minInclusive 1, :maxInclusive 99999}},
+ "Studieduureenheid-v01" {:base "WaardenlijstType-v01"},
+ "Longitude-v01"
+ {:base "WaardeType",
+  :restrictions
+  {:minInclusive -180, :maxInclusive 180, :fractionDigits 8}},
+ "StudielastZwaarte"
+ {:base "NummerType", :restrictions {:pattern "\\d{0,5}"}},
+ "NaamOpleidingKort"
+ {:base "Teksttype", :restrictions {:minLength 1, :maxLength 40}},
+ "KenmerkwaardeBoolean-v01" {:base "IndicatorType"},
+ "Cohortaanvangsdatum-v01" {:base "DatumType"},
+ "KenmerkwaardeGetal-v01"
+ {:base "WaardeType", :restrictions {:fractionDigits 6}},
+ "Cohorttoegangscode-v01"
+ {:base "IdentificatiecodeType", :restrictions {:maxLength 60}},
+ "PropedeutischeFase-v01" {:base "WaardenlijstType-v01"},
+ "AangebodenOpleidingOpleidingsvorm-v01"
+ {:base "WaardenlijstType-v01"},
+ "Opleidingsstelsel-v07" {:base "WaardenlijstType-v01"},
+ "ToestemmingAanmeldingscohortVereist-v01"
+ {:base "WaardenlijstType-v01"},
+ "AangebodenOpleidingExterneIdentificatie-v01"
+ {:base "IdentificatiecodeType", :restrictions {:maxLength 60}},
+ "Taalcode-v01"
+ {:base "WaardenlijstType-v01",
+  :restrictions {:minLength 3, :maxLength 3}},
+ "VerzendendeInstantie-v02"
+ {:base "IdentificatiecodeType",
+  :restrictions {:minLength 1, :maxLength 22}},
+ "Gemeentenaam"
+ {:base "VrijeTekstType", :restrictions {:minLength 1, :maxLength 40}},
+ "OpleidingskenmerkcodeDoelgroeponderwijsSoVso-v02"
+ {:base "WaardenlijstType-v01"},
+ "OpleidingExterneIdentificatie-v01"
+ {:base "IdentificatiecodeType", :restrictions {:maxLength 60}},
+ "IndicatorType" {:base "xsd:boolean"},
+ "KenmerkwaardeTekst1000-v01"
+ {:base "VrijeTekstType",
+  :restrictions {:minLength 1, :maxLength 1000}},
+ "OpleidingskenmerkcodeDoorlopendeLeerlijnenBoVo-v01"
+ {:base "WaardenlijstType-v01"},
+ "KenmerkwaardeEnumeratiewaarde-v01"
+ {:base "VrijeTekstType",
+  :restrictions {:minLength 1, :maxLength 70, :pattern "[A-Z0-9_]*"}},
+ "InternationaleNaamOpleiding-v02"
+ {:base "Teksttype", :restrictions {:minLength 1, :maxLength 225}},
+ "Teksttype" {:base "xsd:token"},
+ "VersneldHO-v01" {:base "WaardenlijstType-v01"},
+ "Keuzeruimtesoort-v03" {:base "WaardenlijstType-v01"},
+ "SCRtoestemmingVerleendTotDeelname-v01"
+ {:base "WaardenlijstType-v01", :restrictions {:maxLength 30}},
+ "NummerKortType"
+ {:base "xsd:short",
+  :restrictions {:minInclusive -32768, :maxInclusive 32767}},
+ "WaardenlijstType-v01"
+ {:base "xsd:token",
+  :restrictions
+  {:minLength 1, :maxLength 70, :pattern "[A-Za-z0-9._\\-/ ]*"}},
+ "OnderwijsaanbiederExterneIdentificatie-v01"
+ {:base "IdentificatiecodeType", :restrictions {:maxLength 60}},
+ "Studieduur-v01" {:base "NummerType"},
+ "Sleutelwaarde-v01"
+ {:base "VrijeTekstType", :restrictions {:minLength 1, :maxLength 25}},
+ "OnderwijslocatieID-v01"
+ {:base "VrijeTekstType",
+  :restrictions
+  {:minLength 7, :maxLength 7, :pattern "(\\d{3}X\\d{3})"}},
+ "UUIDType"
+ {:base "xsd:normalizedString",
+  :restrictions
+  {:pattern
+   "[a-fA-F0-9]{8}-[a-fA-F0-9]{4}-[a-fA-F0-9]{4}-[a-fA-F0-9]{4}-[a-fA-F0-9]{12}"}},
+ "DoelgroeponderwijsBO-v03" {:base "WaardenlijstType-v01"},
+ "ErkendeOrganisatiecode-v01"
+ {:base "IdentificatiecodeType",
+  :restrictions {:minLength 1, :maxLength 22}},
+ "Opleidingscapaciteit-v01"
+ {:base "NummerKortType",
+  :restrictions {:minInclusive 1, :maxInclusive 32000}},
+ "Omschrijving3000-v01"
+ {:base "VrijeTekstType", :restrictions {:maxLength 3000}},
+ "Fouttekst" {:base "VrijeTekstType", :restrictions {:maxLength 200}},
+ "Toelatingseisen-v01" {:base "WaardenlijstType-v01"},
+ "SoortWaardedocument-v01" {:base "WaardenlijstType-v01"},
+ "NummerType" {:base "xsd:integer"},
+ "ToegankelijkVoor-v01"
+ {:base "WaardenlijstType-v01", :restrictions {:maxLength 4}},
+ "OpleidingskenmerkcodeOnderwijsintensiteit-v01"
+ {:base "WaardenlijstType-v01"},
+ "Cohortstatus-v01" {:base "WaardenlijstType-v01"},
+ "StudielastEenheid-v03" {:base "WaardenlijstType-v01"},
+ "ToestemmingAanmeldingscohorttoelichting-v01"
+ {:base "VrijeTekstType",
+  :restrictions {:minLength 1, :maxLength 3000}},
+ "Studiekeuzecheck-v01" {:base "WaardenlijstType-v01"},
+ "OpleidingskenmerkcodeDoorlopendeLeerlijnenVmboMbo-v01"
+ {:base "WaardenlijstType-v01", :restrictions {:maxLength 30}},
+ "OntvangendeInstantie-v02"
+ {:base "IdentificatiecodeType",
+  :restrictions {:minLength 1, :maxLength 22}},
+ "PeriodeBegindatum-v01" {:base "DatumType"},
+ "Onderwijslocatiegebruikeinddatum-v01" {:base "DatumType"},
+ "AangebodenOpleidingscohortidentifcatie-v01"
+ {:base "IdentificatiecodeType", :restrictions {:maxLength 60}},
+ "NfoOpleidingscategorie-v01" {:base "WaardenlijstType-v01"},
+ "HoOpleidingsoort-v01" {:base "WaardenlijstType-v01"}}
diff --git a/src/nl/surf/eduhub_rio_mapper/rio/helper.clj b/src/nl/surf/eduhub_rio_mapper/rio/helper.clj
index 6d33871b..334788ee 100644
--- a/src/nl/surf/eduhub_rio_mapper/rio/helper.clj
+++ b/src/nl/surf/eduhub_rio_mapper/rio/helper.clj
@@ -25,6 +25,7 @@
 
 (def specifications (edn/read (PushbackReader. (io/reader (io/resource "ooapi-mappings.edn")))))
 (def xsd-beheren (edn/read (PushbackReader. (io/reader (io/resource "beheren-schema.edn")))))
+(def xsd-types (edn/read (PushbackReader. (io/reader (io/resource "beheren-types.edn")))))
 
 (defn ooapi-mapping [name key]
   {:pre [(string? name)]}
@@ -135,11 +136,28 @@
       (log/warnf "Missing type for kenmerk (%s), assuming it's :enum" attr-name)
       :enum)))
 
-(defn- process-attribute [attr-name attr-value kenmerk]
+(defn truncate [s n]
+  {:pre [(and (integer? n) (pos? n))]}
+  (if (string? s)
+    (subs s 0 (min (count s) n))
+    s))
+
+(defn- render-name-value [attr-name attr-value type]
+  (let [type-data (xsd-types type)
+        max-len   (-> type-data :restrictions :maxLength)
+        ;; Both Teksttype and VrijeTekstType seem to be used for free-form text, the kind of text
+        ;; that may be truncated. Types like WaardenlijstType-v01 and IdentificatiecodeType also have
+        ;; max-length restrictions, but for those, we prefer to fail rather than silently truncate.
+        value     (if (and max-len (#{"Teksttype" "VrijeTekstType"} (:base type-data)))
+                    (truncate attr-value max-len)
+                    attr-value)]
+    [(duoize attr-name) value]))
+
+(defn- process-attribute [attr-name attr-value kenmerk type]
   (condp apply [attr-value]
     vector?
     (->> attr-value
-         (mapcat #(process-attribute attr-name % kenmerk))
+         (mapcat #(process-attribute attr-name % kenmerk type))
          vec)
 
     map?
@@ -148,7 +166,7 @@
 
     [(if kenmerk
        (kenmerken attr-name (attr-name->kenmerk-type attr-name) attr-value)
-       [(duoize attr-name) attr-value])]))
+       (render-name-value attr-name attr-value type))]))
 
 (defn wrapper-periodes-cohorten [rio-obj]
   (fn [key]
@@ -165,11 +183,11 @@
 
 (declare ->xml)
 
-(defn- process-attributes [{:keys [kenmerk name]} rio-obj]
+(defn- process-attributes [{:keys [kenmerk name type]} rio-obj]
   {:pre [(or (fn? rio-obj)
              (map? rio-obj))]}
   (when-let [attr-value (rio-obj (keyword name))]
-    (process-attribute name attr-value kenmerk)))
+    (process-attribute name attr-value kenmerk type)))
 
 (defn- process-children [child-type rio-obj]
   (->> (rio-obj child-type)
diff --git a/test/nl/surf/eduhub_rio_mapper/rio_test.clj b/test/nl/surf/eduhub_rio_mapper/rio_test.clj
index f8ce9de0..197c8871 100644
--- a/test/nl/surf/eduhub_rio_mapper/rio_test.clj
+++ b/test/nl/surf/eduhub_rio_mapper/rio_test.clj
@@ -33,8 +33,7 @@
             [nl.surf.eduhub-rio-mapper.utils.keystore :as keystore]
             [nl.surf.eduhub-rio-mapper.utils.soap :as soap]
             [nl.surf.eduhub-rio-mapper.utils.xml-utils :as xml-utils])
-  (:import clojure.lang.ExceptionInfo
-           java.io.PushbackReader))
+  (:import java.io.PushbackReader))
 
 (deftest canonicalization-and-digestion
   (let [canonicalizer (fn [id] (str "<wsa:Action "
@@ -102,16 +101,17 @@
      ::ooapi/type "course"
      :client-id "rio-mapper-dev.jomco.nl"}))
 
-;; eigenNaamInternationaal max 225 chars
-(deftest test-and-validate-program-4-invalid
+;; eigenNaamInternationaal is over 225 chars, which is > max-length
+;; but no exception, since fields gets truncated.
+(deftest test-and-validate-program-4-valid
   (let [request (test-handler {::ooapi/id "29990000-0000-0000-0000-000000000000"
                                ::ooapi/type "program"
                                :client-id "rio-mapper-dev.jomco.nl"})]
-    (is (thrown? ExceptionInfo
-                 (-> request
-                     prep-body
-                     (soap/guard-valid-sexp mutator/validator)))
-        "guard should throw an exception")))
+    (is (= :duo:aanleveren_aangebodenOpleiding_request
+           (first (-> request
+                      prep-body
+                      (soap/guard-valid-sexp mutator/validator))))
+        "guard throws an exception if XML invalid according to XSD")))
 
 (defn collect-paths
   "If leaf-node, add current path (and node if include-leaves is true) to acc.