rest file
  PsiElement(EXPLISIT_MARKUP_START)('.. ')
  RestReferenceTarget:REFERENCE
    PsiElement(HYPERLINK)('_Digg:')
  RestLine:LINE_TEXT
    PsiElement(LINE)(' ')
  PsiElement(DIRECT_HYPERLINK)('http://www.digg.com/')
  PsiElement(WHITESPACE)('\n')
  PsiElement(EXPLISIT_MARKUP_START)('.. ')
  RestReferenceTarget:REFERENCE
    PsiElement(HYPERLINK)('_Reddit:')
  RestLine:LINE_TEXT
    PsiElement(LINE)(' ')
  PsiElement(DIRECT_HYPERLINK)('http://www.reddit.com/')