XML : putting colol (:) in xml attribute

I am working on android project and in some portion of task I need to create xml document file. I need to create attribute containing colon like this

  <APPLICAD_EXPORT xsi:noNamespaceSchemaLocation="file:///c:/temp/applicad-export.xsd">    

I can create xml file sucessfully, but the problem is that I cannot add colon for the attribute APPLICAD_EXPORT.

so far I did like this for getting colon for attribute prefix

  serializer.attribute(null, "xsi:noNamespaceSchemaLocation", "file:///c:/temp/applicad-export.xsd");    

but it shows error saying Specification mandate value for attribute xsi

I guess there may be some way to achieve this but I couldn't figured it out.