Thanks Leonel! That works. 

I ended up doing it as follows:

SMALL = lambda x, **kwargs: XML(TAG.small(x, **kwargs).xml())
cache.disk('Hello', lambda: CAT(P('Hello'), SMALL('World')), time_expire=100
)

However, with such an approach, the retrieved cache value is a string 
rather than an XML object which means that I get the following output

Hello
<small>World</small>

as the rendered output rather than

Hello
World

Any further thoughts?

On Wednesday, 15 January 2014 23:43:56 UTC+8, Leonel Câmara wrote:
>
> Just save the generated xml instead
>
>
> cache.disk('Hello', lambda: CAT(P('Hello'), SMALL('World')).xml(),time_expire
> =100)
>

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