extensibility

The Processing Instructions Tab of the Advanced Pane


The Processing Instructions tab of the Advanced Pane lets you enter processing instructions for inclusion with your schema. Processing instructions are a relatively free-form way to include extra information about your schema that applications will need to see. (Comments may not be reported to the application, so aren't of much use in this regard.)

Processing instructions have two components: a target and an instruction. The target needs to be a name beginning with a letter and possibly containing numbers, underscores, dashes, and full stops (typically periods). The instruction is more flexible, though it may not contain the sequence ?>, which ends a processing instruction.

Processing Instructions

The Processing Instructions tab lets you add processing instructions to your DTD.

Although the processing instruction's target has very little definition of its format, the approach used above (with a 'pseudo-attribute') is typical. The target alerts the application that something has to be done, and the pseudo-attributes provide the details, in this case, pointing the application to a URL.

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