How to implement 'optional' parameters for preference settings?

I'm trying to use something like the following

   * Set cite = <cite%IF{"$id=''" then="" else=' id="%id%"'}%%IF{"$conref=''" then="" else=' conref="%conref%"'}%%IF{"$conrefend=''" then="" else=' conrefend="%conrefend%"'}%%IF{"$conaction=''" then="" else=' conaction="%conaction%"'}%%IF{"$conkeyref=''" then="" else=' conkeyref="%conkeyref%"'}%>
   * Set zcite = </cite>

to be able to type something like this:

%cite{id="17" conref="23"}%Citation text 17%zcite%
%cite{id="23" conaction="mark"}%Citation text 23%zcite%

to get

<cite id="17" conref="23">Citation text 17</cite>
<cite id="23" conaction="mark">Citation text 23</cite>

but I get

<cite id="17" conref="23" conrefend="%conrefend%" conaction="%conaction%" conkeyref="%conkeyref%">Citation text 17</cite>
<cite id="23" conref="%conref%" conrefend="%conrefend%" conaction="mark" conkeyref="%conkeyref%">Citation text 23</cite>

Is there any possibility to implement such optional parameters via clever preference settings?

-- FranzJosefGigler - 13 Mar 2013

Here's what I would have expected to work - somehow -

   * Set element = <element%IF{"defined attributeone" then=' attribute1="%attributeone%"' else=""'}%%IF{"defined attributetwo" then=' attribute2="%attributetwo%"' else=""}%%IF{"defined attributethree" then=' attribute3="%attributethree%"' else=""'}%>
   * Set zelement = </element>

but it doesn't.

%element{attributeone="value1" attributetwo="value2"}%

should return

<element attribute1="value1" attribute2="value2">

but I get

<element>

Do I really have to use URLPARAM constructs in some combination with INCLUDE to get this correct?

-- FranzJosefGigler - 14 Mar 2013

Now I've get a working version, I think, allthough it's somewhat ugly.

   * Set xmlelement = <xmlelement%IF{"defined xmlattribute1" then='  attribute1="%xmlattribute1%"' else=""}%%IF{"defined xmlattribute2" then='  attribute2="%xmlattribute2%"' else=""}%%IF{"defined xmlattribute3" then='  attribute3="%xmlattribute3%"' else=""}%>
   * Set zxmlelement = </xmlelement>

%STARTSECTION{"xmlelement"}%%xmlelement{xmlattribute1="%xmlattribute1%" xmlattribute2="%xmlattribute2%" xmlattribute3="%xmlattribute3%"}%%ENDSECTION{"xmlelement"}%

Using

%INCLUDE{"%TOPIC%" section="xmlelement" xmlattribute2="value2" xmlattribute1="value3"}%Some element content.%zxmlelement%

gives the desired

<xmlelement attribute1="value3" attribute2="value2">Some element content.</xmlelement>

But there must be an easier and cleaner way.

-- FranzJosefGigler - 14 Mar 2013

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