add erlang MAP code (from OTP)
diff --git a/asn1/MAP-ExtensionDataTypes.asn b/asn1/MAP-ExtensionDataTypes.asn
new file mode 100644
index 0000000..ab4cb9c
--- /dev/null
+++ b/asn1/MAP-ExtensionDataTypes.asn
@@ -0,0 +1,65 @@
+MAP-ExtensionDataTypes {
+ itu-t identified-organization (4) etsi (0) mobileDomain (0)
+ gsm-Network (1) modules (3) map-ExtensionDataTypes (21) version9 (9)}
+
+DEFINITIONS
+
+IMPLICIT TAGS
+
+::=
+
+BEGIN
+
+EXPORTS
+
+ PrivateExtension,
+ ExtensionContainer,
+ SLR-ArgExtensionContainer;
+
+
+-- IOC for private MAP extensions
+
+
+MAP-EXTENSION ::= CLASS {
+ &ExtensionType OPTIONAL,
+ &extensionId OBJECT IDENTIFIER }
+ -- The length of the Object Identifier shall not exceed 16 octets and the
+ -- number of components of the Object Identifier shall not exceed 16
+
+-- data types
+
+ExtensionContainer ::= SEQUENCE {
+ privateExtensionList [0]PrivateExtensionList OPTIONAL,
+ pcs-Extensions [1]PCS-Extensions OPTIONAL,
+ ...}
+
+SLR-ArgExtensionContainer ::= SEQUENCE {
+ privateExtensionList [0]PrivateExtensionList OPTIONAL,
+ slr-Arg-PCS-Extensions [1]SLR-Arg-PCS-Extensions OPTIONAL,
+ ...}
+
+PrivateExtensionList ::= SEQUENCE SIZE (1..maxNumOfPrivateExtensions) OF
+ PrivateExtension
+
+PrivateExtension ::= SEQUENCE {
+ extId MAP-EXTENSION.&extensionId
+ ({ExtensionSet}),
+ extType MAP-EXTENSION.&ExtensionType
+ ({ExtensionSet}{@extId}) OPTIONAL}
+
+maxNumOfPrivateExtensions INTEGER ::= 10
+
+ExtensionSet MAP-EXTENSION ::=
+ {...
+ -- ExtensionSet is the set of all defined private extensions
+ }
+ -- Unsupported private extensions shall be discarded if received.
+
+PCS-Extensions ::= SEQUENCE {
+ ...}
+
+SLR-Arg-PCS-Extensions ::= SEQUENCE {
+ ...,
+ na-ESRK-Request [0] NULL OPTIONAL }
+
+END