XForms uses properties to define data restrictions, types and behaviors.
A required="true()" property means that the input field is required (cannot be
empty on submit).
A type="decimal" property will only allow a decimal value to be submitted.
A calculate property can calculate a value.
XForms uses the bind element to bind XForms properties to XForms data:
In the example above, the <bind nodeset="person/lname" required="true()">
specifies that the lname input field is required (cannot be empty on submit).
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