Another useful feature is the ability to use @OP tags when defining grid rules. At runtime, the @OP tag is replaced with a value passed to the application as an input parameter. @OP tags are useful for building SQL queries, because they enable an application to use queries with parameters. Several tutorials in the Mobile Application Development Tutorial use the @OP parameter tag with SQL queries.
You can use the @OP tags in grid rules enabling applications to use input parameters as a way of altering the runtime behavior of the rules associated with the application.
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