Added message schema

src/main/resources/message_schema.xsd

@@ -0,0 +1,34 @@
+<?xml version="1.0"?>
+<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
+
+	<xs:element name="Message" type="Message"/>
+
+	<xs:complexType name="Message">
+		<xs:sequence>
+			<xs:element name="MetaData" type="MetaData" />
+			<xs:element name="Content" type="Content"
+				maxOccurs="unbounded" />
+		</xs:sequence>
+	</xs:complexType>
+
+	<xs:complexType name="Content">
+		<xs:sequence>
+			<xs:any />
+		</xs:sequence>
+		<xs:attribute name="type" type="xs:string" />
+	</xs:complexType>
+
+	<!-- Sender ID to be able to reply (maybe not necessary because we already 
+		have Sender ID -->
+
+	<xs:complexType name="MetaData">
+		<xs:sequence>
+			<xs:element name="Sender" type="xs:string" />
+			<xs:element name="Recipient" type="xs:string" />
+			<xs:element name="Time" type="xs:time" />
+			<xs:element name="Date" type="xs:date" />
+			<xs:element name="State" type="xs:boolean" />
+		</xs:sequence>
+	</xs:complexType>
+
+</xs:schema>