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diff --git a/aai-traversal/src/main/resources/antlr4/org/onap/aai/AAIDsl.g4 b/aai-traversal/src/main/resources/antlr4/org/onap/aai/AAIDsl.g4
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+++ b/aai-traversal/src/main/resources/antlr4/org/onap/aai/AAIDsl.g4
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+/**
+ * Define a grammar called AAIDsl
+ */
+grammar AAIDsl;
+
+
+aaiquery: dslStatement;
+
+dslStatement: (queryStep) (traverseStep | unionTraverseStep)* limitStep*;
+
+queryStep : (singleNodeStep |singleQueryStep | multiQueryStep);
+
+unionQueryStep: LBRACKET dslStatement ( COMMA (dslStatement))* RBRACKET;
+
+traverseStep: (TRAVERSE (  queryStep | unionQueryStep));
+
+unionTraverseStep: TRAVERSE unionQueryStep;
+
+singleNodeStep: NODE STORE? ;
+singleQueryStep: NODE STORE? (filterStep | filterTraverseStep);
+multiQueryStep:  NODE STORE? (filterStep | filterTraverseStep) (filterStep)+;
+
+filterStep: NOT? (LPAREN KEY COMMA KEY (COMMA KEY)*RPAREN);
+filterTraverseStep: (LPAREN traverseStep* RPAREN);
+
+limitStep: LIMIT NODE;
+
+LIMIT: 'LIMIT';
+NODE: ID;
+
+KEY: ['] ID ['] ;
+
+AND: [&];
+
+STORE: [*];
+
+OR: [|];
+
+TRAVERSE: [>] ;
+
+LPAREN: [(];
+	
+RPAREN: [)];
+
+COMMA: [,] ;
+
+EQUAL: [=];
+
+LBRACKET: [[];
+	
+RBRACKET: [\]];
+
+NOT: [!];
+
+VALUE: DIGIT;
+
+fragment LOWERCASE  : [a-z] ;
+fragment UPPERCASE  : [A-Z] ;
+fragment DIGIT      : [0-9] ;
+ID
+   : ( LOWERCASE | UPPERCASE | DIGIT) ( LOWERCASE | UPPERCASE | DIGIT | '-' |'.' |'_')*
+   ;
+
+WS : [ \t\r\n]+ -> skip ; // skip spaces, tabs, newlines
+
+