independant instances ?

Hi everyone,

Just another little problem.

I have an instance "Element" and sometimes it has an attribute "name", and sometimes attributes "value" and "operator".
<Element name="year" operator="!=" value="1995"/> (How can i use operator <= or >= ? < and > are reserved characters are'nt they ?)
or
<Element name="blabla"/>

Am I obliged do declare those attributes in <xforms:instance> because if I don't, I cannot set values (with <xforms:setvalue>) to these attributes.
So can I add attributes ?

By the way, sometimes i don't want to have any instances of Element but as i declared one in the xforms:instance, i always have one empty instance at start. Am I obliged to deal with this in the xsd schema ?

Thanks !

Pierre-Julien



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Hi Pierre-Julien,

> (How can i use operator <= or >= ? < and > are reserved characters
> are'nt they ?)

Maybe it works if you use the entities &gt; and &lt; (didn't test it)

> Am I obliged do declare those attributes in <xforms:instance> because
> if I don't, I cannot set values (with <xforms:setvalue>) to these
> attributes. So can I add attributes ?

You could use empty attributes so you can address and fill them when
editing the XForm. I think that's easier than changing the structure of
the instance.

> By the way, sometimes i don't want to have any instances of Element
> but as i declared one in the xforms:instance, i always have one empty
> instance at start. Am I obliged to deal with this in the xsd schema ?

I'm not sure whether i understand the question correctly - i think you
need in fact one (maybe empty) instance on startup so that the structure
of the data is defined.

florian



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Florian Schmitt wrote:
> Hi Pierre-Julien,
>
>> (How can i use operator <= or >= ? < and > are reserved characters
>> are'nt they ?)
>
> Maybe it works if you use the entities &gt; and &lt; (didn't test it)

Correct. Even better, you can use the more legible le, ge, lt and gt
operators.

-Erik

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Hi Pierre-Julien,

On 5/6/07, [hidden email] <[hidden email]> wrote:
> Am I obliged do declare those attributes in <xforms:instance> because if I don't, I cannot set values (with <xforms:setvalue>) to these attributes.
> So can I add attributes ?

You cannot create an attribute in an instance if it is not there
already with <xforms:setvalue>, but your can do so with
<xforms:insert>. You need another instance that contains that
attribute somewhere:

<xforms:instance id="template">
    <dummy my-attribute=""/>
</xforms:instance>

Then you would do:

<xforms:insert context="/to/element"
origin="instance('template')/@my-attribute"/>
<xforms:setvalue ref="/to/element/@my-attribute" value="..."/>

Alex
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Thanks a lot Alex, very helpful ! Using this method, i don't have
empty attributes in my xml file, which is nicer !

Pierre-Julien



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