The fx-bind element attaches constraints and calculations to instance nodes.
| Name | Description | Default |
|---|---|---|
| alert | used to specify a message to be displayed when constraints fail | - |
| ref | XPath pointing to node(s) the bind is attaching to | - |
| calculate | XPath expression to be calculated. Result will become value of node(s) referenced by ref | - |
| constraint | boolean XPath expression to determine validity of node(s) | true |
| readonly | boolean XPath expression to determine readonly/readwrite state | false |
| relevant | boolean XPath expression to determine relevant/non-relevant state | true |
| required | boolean XPath expression to determine required/optional state | false |
| type | datatype - reserved for future versions | string |
none