PdfFormat.renderers.register(core.Span, None, TreeRenderer())
PdfFormat.renderers.register(core.Span, 'cite', CmdRenderer('emph'))
PdfFormat.renderers.register(core.Span, 'cite.code', CmdRenderer('texttt'))
PdfFormat.renderers.register(core.Span, 'emp', CmdRenderer('textbf'))
PdfFormat.renderers.register(core.Span, 'emph', CmdRenderer('emph'))
PdfFormat.renderers.register(core.Span, None, TreeRenderer())
PdfFormat.renderers.register(core.Span, 'cite', CmdRenderer('emph'))
PdfFormat.renderers.register(core.Span, 'cite.code', CmdRenderer('texttt'))
PdfFormat.renderers.register(core.Span, 'emp', CmdRenderer('textbf'))
PdfFormat.renderers.register(core.Span, 'emph', CmdRenderer('emph'))