Max Rydahl Andersen wrote: 
Yes, It's possible.
    

ok, so but wouldn't it make more sense to add it as a seperate tag instead of string based function embedded into an attribute of vpe:if ?

-max
By my opinion no, because in VPE already exists some examples of using vpe:if for testing various conditions, for examples:
Example 1:
    <vpe:tag name="h:graphicImage" case-sensitive="yes">
            <vpe:if test="attrpresent('value')">
Example 2:
    <vpe:if test="(@disabled='true')">
            <vpe:template children="yes" modify="yes">
Examples 3:
        <vpe:if test="@disabled='on'">
            <vpe:template children="no" modify="no">
Example 4:
    <vpe:tag name="img" case-sensitive="no">
        <!-- in this case the tag is a facelets's tag -->
        <vpe:if test="attrpresent('jsfc')" >
            <vpe:template children="no" modify="no">
But  I haven't founded not  one tag  which  used for filter functionality, except vpe:if, so I think it better to use vpe:if for filtering templates using various
functions like tld_version, attrpresent and others. 

  

    

      

        
In VPE was added support for taglib versions
see(http://jira.jboss.com/jira/browse/JBIDE-1466).
Checks for versions was resolved in
org.jboss.tools.vpe.editor.template.expression.VpeFunctionTldVersionCheck
class.
Here some examples how it's can be used in template configuration file:
Example 1:
     <vpe:tag name="f:testTldVersion" case-sensitive="yes">
         <vpe:if test="tld_version('min=0.0 max=1.2')" >
         <vpe:template children="yes" modify="yes">
             <div  style="background-color:red">
             Tld Check function
             </div>
         </vpe:template>
         </vpe:if>
     </vpe:tag>
 Example 2:
     <vpe:tag name="f:testTldVersion" case-sensitive="yes">
         <vpe:if test="tld_version('min=0.0')" >
         <vpe:template children="yes" modify="yes">
             <div  style="background-color:red">
             Tld Check function
             </div>
         </vpe:template>
        </vpe:if>
    </vpe:tag>
 Example 3:
 <vpe:tag name="f:testTldVersion" case-sensitive="yes">
         <vpe:if test="tld_version('max=1.2')" >
         <vpe:template children="yes" modify="yes">
             <div  style="background-color:red">
             Tld Check function
             </div>
         </vpe:template>
         </vpe:if>
    </vpe:tag>
Function tld_version() checks for taglib version in projects, here can
be 2 parametrs:
1) 'min' -  minimal taglib  version
2) 'max' - maximal taglib version
In function can' be specified only one paramter 'min'  or 'max'.
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