EXHIBIT A

JOINT FILING AGREEMENT
PURSUANT TO RULE 13d-1(k)(1)

     The undersigned acknowledge and agree that the foregoing Statement on Schedule 13D/A with respect to the ownership by each of the undersigned of shares of Versant Corporation is filed jointly on behalf of each of the undersigned and that all subsequent amendments to the Statement on Schedule 13D/A shall be filed on behalf of each of the undersigned without the necessity of filing additional joint filing agreements. This joint filing agreement may be included as an exhibit to such joint filing. Each of the undersigned acknowledges that each shall be responsible for the timely filing of such amendments with respect to information concerning such undersigned reporting person, and for the completeness and accuracy of the information concerning such undersigned reporting person, contained therein, but shall not be responsible for the completeness and accuracy concerning the others, except to the extent that such reporting person knows or has reason to believe that such information is inaccurate. This agreement may be executed in any number of counterparts and all of such counterparts taken together shall constitute one and the same instrument.

Date: May 3, 2005

VERTEX TECHNOLOGY FUND LTD
By:	/s/ Chua Joo Hock
Name:	Chua Joo Hock
Title:	Director
VERTEX TECHNOLOGY FUND (II) LTD
By:	/s/ Chua Joo Hock
Name:	Chua Joo Hock
Title:	Director
VERTEX INVESTMENT INTERNATIONAL (I) INC.
By:	/s/ Toh Kim Huat
Name:	Toh Kim Huat
Title:	Director

VERTEX INVESTMENT INTERNATIONAL (III) INC.
By:	/s/ Toh Kim Huat
Name:	Toh Kim Huat
Title:	Director
VERTEX MANAGEMENT PTE LTD
By:	/s/ Chua Joo Hock
Name:	Chua Joo Hock
Title:	Director
VERTEX MANAGEMENT (II) PTE LTD
By:	/s/ Chua Joo Hock
Name:	Chua Joo Hock
Title:	Executive Director
VERTEX VENTURE HOLDINGS LTD
By:	/s/ Tan Mui Hong
Name:	Tan Mui Hong
Title:	Director
SINGAPORE TECHNOLOGIES PTE LTD
By:	/s/ Tan Ai Ching
Name:	Tan Ai Ching
Title:	Director

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