diff --git a/xsd/parse.go b/xsd/parse.go
index 0e6890d..6db1066 100644
--- a/xsd/parse.go
+++ b/xsd/parse.go
@@ -147,7 +147,14 @@ func Parse(docs ...[]byte) ([]Schema, error) {
 		if err := s.parse(root); err != nil {
 			return nil, err
 		}
-		parsed[tns] = s
+		if existingSchema, found := parsed[tns]; found {
+			err = existingSchema.MergeTypes(&s)
+			if err != nil {
+				return nil, fmt.Errorf("error merging types into existing schema: %v", err)
+			}
+		} else {
+			parsed[tns] = s
+		}
 	}
 
 	for _, s := range parsed {
diff --git a/xsd/xsd.go b/xsd/xsd.go
index 1c1f6bb..35a58f3 100644
--- a/xsd/xsd.go
+++ b/xsd/xsd.go
@@ -19,6 +19,7 @@ import (
 	"fmt"
 	"io"
 	"regexp"
+	"strings"
 	"time"
 
 	"aqwari.net/xml/xmltree"
@@ -110,6 +111,19 @@ type Schema struct {
 	Doc string
 }
 
+// MergeTypes adds the types from the incoming schema into
+// the receiving schema, returns error if the schemas have
+// different target namespaces.
+func (s *Schema) MergeTypes(incoming *Schema) error {
+	if !strings.EqualFold(s.TargetNS, incoming.TargetNS) {
+		return fmt.Errorf("cannot merge types from %s into %s", incoming.TargetNS, s.TargetNS)
+	}
+	for n,t := range incoming.Types {
+		s.Types[n] = t
+	}
+	return nil
+}
+
 // FindType looks for a type by its canonical name. In addition to the types
 // declared in a Schema, FindType will also search through the types that
 // a Schema's top-level types are derived from. FindType will return nil if