configurationengine/doc/plugins/imageml-plugin/examples/bmp_and_optional_mask.imageml
<?xml version="1.0" encoding="UTF-8"?>
<imageml xmlns="http://www.s60.com/xml/imageml/1">
<!--
BMP to MBM conversion with an optional mask bitmap. The value of
TestSettings.ConeInputBmpMask.localPath is empty, but since the 'optional'
attribute is set to be 'true', it is silently ignored. If the attribute
was not there, an error would be printed during generation.
-->
<output file="cone_with_optional_mask.mbm">
<input file="${TestSettings.ConeInputBmp.localPath}" depth="c24"/>
<input file="${TestSettings.ConeInputBmpMask.localPath}" depth="c1" optional='true'/>
</output>
</imageml>