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The parameters object used by data binding expressions contains parameter values that are passed to the workflow rule from the client. Parameters may be added to a dataSource by declaring one or more parameter elements with their name and dataType attributes.You may specify a default value to be used if the client does not send a value.

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<dataSource id="test"> 
    <table name="project" role="main" ></table> 
    <field table="project" name="project_id" ></field> 
    <field table="project" name="requestor" ></field> 
    <field table="project" name="status" ></field> 
    <parameter name="status" dataType="text" value=""/> 
    <sql dialect="generic"> 
         SELECT project_id, requestor, status FROM project 
        WHERE status = ${parameters["status"]} 
    </sql> 
</dataSource>

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