XForms Functions

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XForms has some predefined functions. But you can also call functions defined in scripts.

XForms Functions

The XForms function library includes the entire XPath 1.0 core function library.

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The Below table lists the additional functions within XForms:

Function Description
boolean-from-string(string) Returns true if the parameter string is "true" or "1" and false if the parameter string is "false" or "0"
if(booleantest, string1, string2) Evaluates the Booleantest parameter and returns string1 if the test is true, and string2 if the test is false
avg(node-set) Returns the average of all the nodes in the specified node-set. The value of each node is converted to a number. If the node-set is empty it returns NaN

<values>
<value>10</value>
<value>50</value>
<value>0</value>
</values>

avg(/values/value)

Returns: 20
min(node-set) Returns the minimum value of all the nodes in the specified node-set. The value of each node is converted to a number. If the node-set is empty it returns NaN

<values>
<value>10</value>
<value>20</value>
<value>0</value>
</values>

min(/values/value)

Returns: 0
max(node-set) Returns the maximum value of all the nodes in the specified node-set. The value of each node is converted to a number. If the node-set is empty it returns NaN

<values>
<value>10</value>
<value>20</value>
<value>0</value>
</values>

max(/values/value)

Returns: 20
count-non-empty(node-set) Returns the number of non-empty nodes in the specified node-set

<values>
<value>10</value>
<value>20</value>
<value>0</value>
<value />
</values>

count-non-empty(/values/value)

Returns: 3
index(string) Returns the current index for a given repeat set
property(string) Returns the property named by the string parameter
  • property("version") - returns the XForms version number
  • property("conformance-level") - returns the XForms conformance level ("basic" or "full")
now() Returns the current system date and time in xs:dateTime format
instance(string) An XForms Model can contain more than one instance. This function returns the root node of the specified instance data

<xforms:instance id="orderform">
<firstName>Guru</firstName>
</xforms:instance>

ref="instance('orderform')/firstName"

This example returns a node-set that consists of the firstName element node from the instance named "orderform"

days-from-date(string) If the string parameter represents a legal xs:date or xs:dateTime, it returns the number of days between the specified date and 1970-01-01, otherwise it returns NaN

days-from-date("2002-01-02") returns 11689
days-from-date("1969-12-29") returns -3

seconds-from-dateTime(string) If the string parameter represents a legal xs:dateTime, it returns the number of seconds between the specified dateTime and 1970-01-01T00:00:00Z, otherwise it returns NaN
seconds(string) If the string parameter represents a legal xs:duration, it returns the number specified in the seconds component plus 60 * the number specified in the minutes component, plus 60 * 60 * the number specified in the hours component, plus 60 * 60 * 24 * the number specified in the days component, otherwise it returns NaN

seconds("P1Y2M") returns 0
seconds("P3DT10H30M1.5S") returns 297001.5
seconds("3") returns NaN

months(string) If the string parameter represents a legal xs:duration, it returns the number specified in the months component plus 12 * the number specified in the years component, otherwise it returns NaN

months("P1Y2M") returns 14
months("-P19M") returns -19


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