Ant - Change extension on file

I have an exec in Ant that looks like this:

<exec taskname = "convert"
executable = "convert"
failonerror = "true">
<arg line="in=@{file} out=???" />

I want to use a command that converts a file. The in infile name has one extension and the out file another, but the rest of the file name should be the same. How do I get it this way?

The arg line is messed up since I don't know what to write.
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You could use a property for the name up to the extension
<arg line="in=@${file.without.extension}.in" out="${file.without.extension}.out" />
Actually that should maybe be more like:

<arg line="in=${file.without.extension}.in" />
<arg line="out=${file.without.extension}.out" />

but i think you probably get the general principle
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Mick BarryJava DeveloperCommented:

<arg line="in=${file}.in out=${file}.out" />
Each argument should be tagged separately (that's what they're for)
mdolandAuthor Commented:
It sounds straight, but this is the way it looks outside:

<for param="file">
                              <!-- Perform encoding for all files included in the fileset specified by the macro attributes -->
                                    <fileset dir="@{dir}">
                                          <include name="@{includes}" />
                                          <exclude name="@{excludes}" />
                                    <exec      taskname      = "convert"
                                                executable      = "convert"
                                                failonerror      = "true">
                                          <arg line="in=@{file} out=???" />

                                    <!-- Remove files if keeporiginals attribute is not set to true -->
                                          <equals arg1="@{keeporiginals}" arg2="false" casesensitive="false" />
                                                <delete quiet="true" file="@{file}" />

I get it in as a filesset from an include statement, but I don't get it how I should do to get the extension off there.
If you know the extension, you can use

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Mick BarryJava DeveloperCommented:
if you know the output extension the using basename mentioned by cehj would allow you to do:

<basename property="filebase" file="${file}"/>
<arg line="in=@{file} out=${filebase}.out" />
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