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How to use XPath 2.0 date functions in my xform

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npujol73
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How to use XPath 2.0 date functions in my xform

npujol73
Ok guys, this may be an easy one I am trying to use this function
within my xform:

<xforms:output value="fn:subtract-dates($previousItemEndDate,$previousItemEndDate)"/>
but no luck, I get an error popup message indicating the function
cannot be found. I tried with/without the fn namespace.

Can anybody help? Thanks! Here is the xform:

<?xml version="1.0" encoding="UTF-8"?>
<html xmlns="http://www.w3.org/1999/xhtml"
xmlns:xforms="http://www.w3.org/2002/xforms"
xmlns:xhtml="http://www.w3.org/1999/xhtml"
    xmlns:ev="http://www.w3.org/2001/xml-events"
xmlns:widget="http://orbeon.org/oxf/xml/widget"
xmlns:xs="http://www.w3.org/2001/XMLSchema"
    xmlns:xxforms="http://orbeon.org/oxf/xml/xforms"
xmlns:fn="http://www.w3.org/TR/xpath-functions" >
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"/>
        <xforms:model id="fr-form-model">
            <xforms:instance id="data">
                <root xmlns="">
                    <item1>2009-01-01</item1>
                    <item2>2009-02-01</item2>
                </root>
            </xforms:instance>
            <xforms:bind nodeset="instance('data')/item1" required="true()"/>
            <xforms:bind nodeset="instance('data')/item2" required="true()"/>
        </xforms:model>
    </head>
    <body>
        <xforms:group ref="instance('data')">
            <xforms:input ref="item1">
                <xforms:label>Field1</xforms:label>
            </xforms:input>
            <xforms:input ref="item2">
                <xforms:label>Field2</xforms:label>
            </xforms:input>
            <xforms:trigger>
                <xforms:label>Add Entry</xforms:label>
                <xforms:action ev:event="DOMActivate">
                    <xxforms:variable name="currentItem" select="item1"/>
                    <xxforms:variable name="previousItem" select="item2"/>
                    <xforms:message><xforms:output
value="$currentItem"/>,<xforms:output
value="$previousItem"/></xforms:message>
                    <xxforms:variable name="previousItemEndDate"
value="xs:date($previousItem)"/>
                    <xxforms:variable name="currentItemStartDate"
value="xs:date($currentItem)"/>
                    <xforms:message><xforms:output
value="fn:subtract-dates($previousItemEndDate,$previousItemEndDate)"/></xforms:message>
                </xforms:action>
            </xforms:trigger>
        </xforms:group>
    </body>
</html>


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Hank Ratzesberger
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Re: How to use XPath 2.0 date functions in my xform

Hank Ratzesberger
Hi Nicolas,

A good reference is :

http://www.w3.org/TR/xpath-functions/

where I notice that subtract dates is an operator (op:) so that
the parser allows you to use it intrinsically:

myDate1 - myDate2

You may specifically need to cast for the parser to recognize:

xs:date(myDate1) - xs:date(myDate2)

Regards,
Hank

On Nov 9, 2009, at 10:11 AM, Nicolas Pujol wrote:

> Ok guys, this may be an easy one I am trying to use this function
> within my xform:
>
> <xforms:output value="fn:subtract-dates($previousItemEndDate,
> $previousItemEndDate)"/>
> but no luck, I get an error popup message indicating the function
> cannot be found. I tried with/without the fn namespace.
>
> Can anybody help? Thanks! Here is the xform:
>
> <?xml version="1.0" encoding="UTF-8"?>
> <html xmlns="http://www.w3.org/1999/xhtml"
> xmlns:xforms="http://www.w3.org/2002/xforms"
> xmlns:xhtml="http://www.w3.org/1999/xhtml"
>     xmlns:ev="http://www.w3.org/2001/xml-events"
> xmlns:widget="http://orbeon.org/oxf/xml/widget"
> xmlns:xs="http://www.w3.org/2001/XMLSchema"
>     xmlns:xxforms="http://orbeon.org/oxf/xml/xforms"
> xmlns:fn="http://www.w3.org/TR/xpath-functions" >
>     <head>
>         <meta http-equiv="Content-Type" content="text/html;  
> charset=UTF-8"/>
>         <xforms:model id="fr-form-model">
>             <xforms:instance id="data">
>                 <root xmlns="">
>                     <item1>2009-01-01</item1>
>                     <item2>2009-02-01</item2>
>                 </root>
>             </xforms:instance>
>             <xforms:bind nodeset="instance('data')/item1"  
> required="true()"/>
>             <xforms:bind nodeset="instance('data')/item2"  
> required="true()"/>
>         </xforms:model>
>     </head>
>     <body>
>         <xforms:group ref="instance('data')">
>             <xforms:input ref="item1">
>                 <xforms:label>Field1</xforms:label>
>             </xforms:input>
>             <xforms:input ref="item2">
>                 <xforms:label>Field2</xforms:label>
>             </xforms:input>
>             <xforms:trigger>
>                 <xforms:label>Add Entry</xforms:label>
>                 <xforms:action ev:event="DOMActivate">
>                     <xxforms:variable name="currentItem"  
> select="item1"/>
>                     <xxforms:variable name="previousItem"  
> select="item2"/>
>                     <xforms:message><xforms:output
> value="$currentItem"/>,<xforms:output
> value="$previousItem"/></xforms:message>
>                     <xxforms:variable name="previousItemEndDate"
> value="xs:date($previousItem)"/>
>                     <xxforms:variable name="currentItemStartDate"
> value="xs:date($currentItem)"/>
>                     <xforms:message><xforms:output
> value="fn:subtract-dates($previousItemEndDate,
> $previousItemEndDate)"/></xforms:message>
>                 </xforms:action>
>             </xforms:trigger>
>         </xforms:group>
>     </body>
> </html>
>
> --
> You receive this message as a subscriber of the [hidden email]  
> mailing list.
> To unsubscribe: mailto:[hidden email]
> For general help: mailto:[hidden email]?subject=help
> OW2 mailing lists service home page: http://www.ow2.org/wws
Hank Ratzesberger
NEES@UCSB
Institute for Crustal Studies,
University of California, Santa Barbara
805-893-8042







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