### Name: writeThemesXML
### Title: A function to author repository theme XML files
### Aliases: writeThemesXML
### Keywords: utilities

### ** Examples

   z <- list(Theme1=list(Description="One simple test",
                         Repository="http://www.repURL.com/",
                         Packages=list("Biobase", "Ruuid", "ROC", "geneplotter")),
             Theme2=list(Description="Another simple test",
                         Repository="http://www.repURL.com",
                         Packages=list(buildPkgInfo("annotate", "1.3.0"),
                         "genefilter", buildPkgInfo("affy", "1.3.0"))))
   ## Using tempfile() instead of default filename for example
   writeThemesXML(z, tempfile())