Create a security rule set to process the result set. Give the rule set the name that you provided in Step 1. as the "Ruleset Name for Resultset" parameter. Then create a rule to match the columns in the result set that you want to mask, using the Metadata matcher. For the rule action, select Content Masking. When you select the Content Masking action, provide the name of the third rule set that you will create in the next step, the XML masking rule set. Finally, you must create a rule within this second rule set to apply the masking function.