DOCBOOK: Date in PCDATA?

Is there any possibility to encode date in text?
<date> in current (4.x) dtds is used only in
bibliocomponent.mix module (so, we cannot use that in PCDATA)

I need wrote:
<abstract><para>
Test was performed at <date notation="european"> 20.01.1999 </date>
</para> etc...

currently I plan to write customisation layer to both DTD and DSSSL
(and mayby other) but I want to minimalize incompatibilities with
,,standard'' docbook.

-- 
Ziemek Borowski ZB137-RIPE http://ziembor.waw.pl/zmb/ 1024D/5858F604