xslt - Xquery to concatenate names if available -

we have incoming message name field below, "givenname" field unbounded:

<name>   <surname>louis</surname>   <givenname>john</givenname>   <givenname>andy</givenname> </name> 

we need pass message other end system as:

<name>   <fullname>louis, john andy</fullname> </name> 

so, if givenname field not present in input, transformation should produce:

<name>   <fullname>louis</fullname> </name> 

and if multipe givenname present in input should concatenate seperating space.

i tried using concatenate function not giving desired result. tried using:

<ns1:fullname>{ fn:concat($submittedby/ns1:name/ns1:surname,", ", (for $givenname in $submittedby/ns1:name/ns1:givenname return fn:concat(data($givenname), "")) ) }</ns1:fullname> 

but producing like:

<name>   <fullname>louis, johnandy</fullname> </name> 

i having trouble in separating givenname space if present.

could please provide suggestion.

tia,

fn:concat($str1, $str2, ...) expects single string per argument , concatenates of them 1 string. concatenating sequence of strings , specifying should go between parts, can use fn:string-join($strs, $joiner):

string-join(('foo', 'bar', 'baz'), '::') 

produces string foo::bar::baz.