You can create form designs that go beyond simple data capture. Using LiveCycle Designer ES, you can integrate your form designs with corporate databases or web services to build and maintain data capture solutions that read from, validate against, and add to corporate data sources. To do this, you connect your form design to one or more data sources and bind the data to one or more fields in your form design.
XML schemas specify how to formally describe the elements in an XML document. By connecting to an XML schema, you can bind the elements and attributes defined in the schema to fields in the form design. You can also select the XML data root element to use for the connection.
OLEDB is a Microsoft integration standard, which provides low-level application program interface (API) to data across an organization. By connecting to an OLEDB database, you can create form designs that serve as a data entry or capture tool for enterprise database servers. You can also use a database to provide content for portions of a form at run time.
By connecting to an XML file, you can bind fields to the elements and attributes defined in the XML file. This method is useful when you do not have an XML schema, but you have an XML file that you can use as a sample.
WSDL files describe web services by using XML. By connecting to a WSDL file, you can bind fields in a form design to one or many web services. You can create a data connection to a WSDL document on a web server and use HTTP/HTTPS or message level authentication or both to control access.
See also 

Working with data sources