diff --git a/asterix-external-data/src/main/resources/schema/library.xsd b/asterix-external-data/src/main/resources/schema/library.xsd
new file mode 100644
index 0000000..3dc4659
--- /dev/null
+++ b/asterix-external-data/src/main/resources/schema/library.xsd
@@ -0,0 +1,42 @@
+<?xml version="1.0" encoding="ISO-8859-1" ?>
+<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:lib="library" targetNamespace="library" elementFormDefault="qualified">
+
+<!-- definition of simple types --> 
+<xs:element name="language" type="xs:string"/>
+<xs:element name="name" type="xs:string"/>
+<xs:element name="arguments" type="xs:string"/>
+<xs:element name="return_type" type="xs:string"/>
+<xs:element name="function_type" type="xs:string"/>
+<xs:element name="definition" type="xs:string"/>
+
+<!-- definition of complex elements -->
+<xs:element name="function">
+  <xs:complexType>
+    <xs:sequence>
+      <xs:element ref="lib:name"/>
+      <xs:element ref="lib:function_type"/>
+      <xs:element ref="lib:arguments"/>
+      <xs:element ref="lib:return_type"/>
+      <xs:element ref="lib:definition"/>
+    </xs:sequence>
+  </xs:complexType>
+</xs:element>
+
+<xs:element name="functions">
+  <xs:complexType>
+    <xs:sequence>
+      <xs:element ref="lib:function" maxOccurs="unbounded"/>
+    </xs:sequence>
+  </xs:complexType>
+</xs:element>
+
+<xs:element name="library">
+  <xs:complexType>
+    <xs:sequence>
+      <xs:element ref="lib:language"/>
+      <xs:element ref="lib:functions" minOccurs="0"/>
+    </xs:sequence>
+  </xs:complexType>
+</xs:element>
+
+</xs:schema>