Several of the database services can accept input from a browser-based client. (The descriptions of the database services in the webMethods Integration Server Built-In Services Reference indicate whether you can invoke a built-in database service from a browser-based client.) When a browser-based client submits input variables containing row information, these services automatically convert the row information into a nested IData object. The service determines which variables to convert based on the names of the variables. All variables except those whose names begin with _ or $db are converted into nested IData objects.