diff --git a/_examples/advanced/json_map_body.go b/_examples/advanced/json_map_body.go
index 5e80d7e..33b56d6 100644
--- a/_examples/advanced/json_map_body.go
+++ b/_examples/advanced/json_map_body.go
@@ -3,10 +3,21 @@ package main
 import (
 	"context"
 	"encoding/json"
+	"net"
 
+	"github.com/google/uuid"
+	"github.com/swaggest/jsonschema-go"
 	"github.com/swaggest/usecase"
 )
 
+type URL string
+
+func (URL) PrepareJSONSchema(schema *jsonschema.Schema) error {
+	schema.WithFormat("uri")
+
+	return nil
+}
+
 type JSONMapPayload map[string]float64
 
 type jsonMapReq struct {
@@ -19,13 +30,25 @@ func (j *jsonMapReq) UnmarshalJSON(data []byte) error {
 	return json.Unmarshal(data, &j.JSONMapPayload)
 }
 
-func jsonMapBody() usecase.Interactor {
-	type jsonOutput struct {
-		Header string         `json:"inHeader"`
-		Query  int            `json:"inQuery"`
-		Data   JSONMapPayload `json:"data"`
-	}
+type jsonOutput struct {
+	Header string         `json:"inHeader"`
+	Query  int            `json:"inQuery"`
+	Data   JSONMapPayload `json:"data"`
+	UUIDs  []uuid.UUID    `json:"uuids"` // Schema provided via type mapping globally.
+	IPs    []net.IP       `json:"ips"`   // Schema provided via type mapping globally.
+	URLs1  []URL          `json:"urls1"` // Schema prepared for named type.
+	URLs2  []string       `json:"urls2"` // Schema updated in parent, no named type needed.
+}
+
+func (jsonOutput) PrepareJSONSchema(schema *jsonschema.Schema) error {
+	prop := schema.Properties["urls2"]
+	items := prop.TypeObjectEns().ItemsEns()
+	items.SchemaOrBoolEns().TypeObjectEns().WithFormat("uri").WithMinLength(5)
 
+	return nil
+}
+
+func jsonMapBody() usecase.Interactor {
 	u := usecase.NewIOI(new(jsonMapReq), new(jsonOutput), func(ctx context.Context, input, output interface{}) (err error) {
 		var (
 			in  = input.(*jsonMapReq)
diff --git a/_examples/advanced/router.go b/_examples/advanced/router.go
index 901432d..5a9f27a 100644
--- a/_examples/advanced/router.go
+++ b/_examples/advanced/router.go
@@ -3,9 +3,11 @@ package main
 import (
 	"context"
 	"errors"
+	"net"
 	"net/http"
 	"reflect"
 
+	"github.com/google/uuid"
 	"github.com/swaggest/jsonschema-go"
 	"github.com/swaggest/openapi-go/openapi3"
 	"github.com/swaggest/rest"
@@ -46,6 +48,21 @@ func NewRouter() http.Handler {
 		}
 	})
 
+	// Foreign types can be documented with type mapping to schema (uuid.UUID would be {"type":"string", "format":"uuid"}).
+	uuidSchema := jsonschema.String.ToSchemaOrBool()
+	uuidSchema.TypeObjectEns().WithFormat("uuid")
+
+	s.OpenAPICollector.Reflector().AddTypeMapping(
+		uuid.UUID{},
+		uuidSchema,
+	)
+
+	// Or with type mapping to type (net.IP would be string).
+	s.OpenAPICollector.Reflector().AddTypeMapping(
+		net.IP{},
+		"",
+	)
+
 	s.OpenAPICollector.CombineErrors = "anyOf"
 
 	s.Use(
diff --git a/_examples/go.mod b/_examples/go.mod
index 262175c..44bb09f 100644
--- a/_examples/go.mod
+++ b/_examples/go.mod
@@ -10,6 +10,7 @@ require (
 	github.com/bool64/httpmock v0.1.1
 	github.com/bool64/httptestbench v0.1.3
 	github.com/go-chi/chi/v5 v5.0.7
+	github.com/google/uuid v1.3.0
 	github.com/kelseyhightower/envconfig v1.4.0
 	github.com/stretchr/testify v1.7.1
 	github.com/swaggest/assertjson v1.6.8
diff --git a/_examples/go.sum b/_examples/go.sum
index d27f95b..c2fe48e 100644
--- a/_examples/go.sum
+++ b/_examples/go.sum
@@ -37,6 +37,8 @@ github.com/golang/protobuf v1.4.3/go.mod h1:oDoupMAO8OvCJWAcko0GGGIgR6R6ocIYbsSw
 github.com/google/go-cmp v0.3.0/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMywk6iLU=
 github.com/google/go-cmp v0.3.1/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMywk6iLU=
 github.com/google/go-cmp v0.4.0/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
+github.com/google/uuid v1.3.0 h1:t6JiXgmwXMjEs8VusXIJk2BXHsn+wx8BZdTaoZ5fu7I=
+github.com/google/uuid v1.3.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
 github.com/hpcloud/tail v1.0.0/go.mod h1:ab1qPbhIpdTxEkNHXyeSf5vhxWSCs/tWer42PpOxQnU=
 github.com/iancoleman/orderedmap v0.2.0 h1:sq1N/TFpYH++aViPcaKjys3bDClUEU7s5B+z6jq8pNA=
 github.com/iancoleman/orderedmap v0.2.0/go.mod h1:N0Wam8K1arqPXNWjMo21EXnBPOPp36vB07FNRdD2geA=