vim syntax highlighting: support for @{...} python and for <comment> tags

vim/syntax/catsoop.vim

@@ -14,12 +14,16 @@ unlet b:current_syntax
 syntax include @Python syntax/python.vim
 syntax region pythonCode matchgroup=pythonTag start="<python>" end="</python>" containedin=@Markdown contains=@Python
 syntax region pythonCodeQuestion matchgroup=questionTag start="<question [^>]*>" end="</question>" containedin=@Markdown contains=@Python
+syntax region pythonShort start="@{" end="}" containedin=@Markdown contains=@Python
 
 let b:current_syntax=''
 unlet b:current_syntax
 syntax include @TeX syntax/tex.vim
 syntax region latexDisplayMath start="\$\$" end="\$\$" keepend containedin=@Markdown contains=@TeX
 
+syntax region catsoopComment start="<comment>" end="</comment>"
+
+hi link catsoopComment Comment
 hi link pythonTag htmlTag
 hi link questionTag htmlTag
 let b:current_syntax = 'catsoop'