Development
InfoPath as a Microsoft Office product features a different usage-scenario from the other Office applications, such as Word and Excel. In order to use InfoPath to fill in a form, a user must have a designer develop an InfoPath template first.
All the data stored in InfoPath forms are stored in an XML format, which is referred to as the "data source".
InfoPath provides several controls (e.g. Textbox, Radio Button, Checkbox, etc.) to present data in the data source to end-users. For data tables and secondary data sources, "Repeating Table" and other repeating controls are introduced. For each of these controls, actions (called "rules") can be bound in. A rule defines a specific action that will be performed under certain conditions. For example, a simple rule could be: "Set field 'Total' to 100 when number in field 'field1' changes".
More complex actions can be developed through "data validation". (Data validation can also be done with VBA programming inside a Microsoft Word document or Excel spreadsheet.)
Read more about this topic: Microsoft Info Path
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