1 files changed, 21 insertions, 0 deletions
diff --git a/types.go b/types.go
index abb02e2..bd51350 100644
--- a/types.go
+++ b/types.go
@@ -1,6 +1,7 @@
 package mtmap
 
 import (
+	"fmt"
 	"github.com/anon55555/mt"
 )
 
@@ -34,3 +35,23 @@ type StaticObj struct {
 	Pos  [3]float32
 	Data string
 }
+
+type ErrInvalidNodeName struct {
+	Name string
+}
+
+func (e ErrInvalidNodeName) Error() string {
+	return fmt.Sprintf("invalid node \"%v\"", e.Name)
+}
+
+type ErrInvalidNodeId struct {
+	Id mt.Content
+}
+
+func (e ErrInvalidNodeId) Error() string {
+	return fmt.Sprintf("invalid node %v", e.Id)
+}
+
+func isSpecial(id mt.Content) bool {
+	return id >= 125 && id <= 127
+}