Data (for XML Form Documents)
The Data tab page of the Properties dialog for an XML Form document offers some XML forms settings.
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XML data model
Select a model from the list of all models in the current document.
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Select or enter the name of a binding. Selecting the name of an existing binding associates the binding with the form control. Entering a new name creates a new binding and associates it with the form control.
Binding expression
Enter the DOM node to bind the control model to. Click the ... button for a dialog to enter the XPath expression.
Required
Specifies if the item must be included on the XForm.
Relevant
Declares the item as relevant.
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Declares the item as read-only.
Constraint
Declares the item as a constraint.
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Declares that the item is calculated.
Data type
Select a data type which the control should be validated against.
x
Select a user-defined data type and click the button to delete the user-defined data type.
+
Click the button to open a dialog where you can enter the name of a new user-defined data type. The new data type inherits all facets from the currently selected data type.
The following lists all facets that are valid for data types. Some facets are only available for some data types.
Whitespaces
Specifies how whitespaces are to be handled when a string of the current data type is being processed. Possible values are "Preserve", "Replace", and "Collapse". The semantics follow the definition at https://www.w3.org/TR/xmlschema-2/#rf-whiteSpace.
Pattern
Specifies a regular expression pattern. Strings validated against the data type must conform to this pattern to be valid. The XSD data type syntax for regular expressions is different from the regular expression syntax used elsewhere in LibreOffice, for example in the Find & Replace dialog.
Digits (total)
Specifies the maximum total number of digits that values of the decimal data type can have.
Digits (fraction)
Specifies the maximum total number of fractional digits that values of the decimal data type can have.
Max. (inclusive)
Specifies an inclusive upper bound for values.
Max. (exclusive)
Specifies an exclusive upper bound for values.
Min. (inclusive)
Specifies an inclusive lower bound for values.
Min. (exclusive)
Specifies an exclusive lower bound for values.
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Specifies the number of characters for a string.
Length (at least)
Specifies the minimum number of characters for a string.
Length (at most)
Specifies the maximum number of characters for a string.