FOREWORD The purpose of this addendum is to present changes to ANSI/ASHRAE Standard 135-2012 and Addenda. These modifications are the result of change proposals made pursuant to the ASHRAE continuous maintenance procedures and of deliberations within Standing Standard Project Committee 135. The changes are summarized below. 135-2012ba-1. Add CSML Descriptions of BACnet Devices@ p. 2 135-2012ba-2. Add Semantic Tags to All Objects@ p. 15 135-2012ba-3. Extend Structured View Object to Contain Semantic Information@ p. 16 135-2012ba-4. Change Clause 21 identifiers to use a consistent format@ p. 19 135-2012ba-5. Add Data Revisioning Capabilities to CSML@ p. 20 In the following document@ language to be added to existing clauses is indicated through the use of italics@ while deletions are indicated byWhere entirely new subclauses are added@ plain type is used throughout. All other material in this addendum is provided for context only.