XML parameter types - attribute to allow HTML tags?

[seadhna]

When building an Elxis template, is there a parameter attribute to allow HTML tags?

e.g.  Optional attribute multilingual (value: 0 or 1). If multilingual = 1 then the text element becomes multilingual and the user is able to apply different values for each language.
e.g. <param type="text" name="myaddress" default="" label="Address" description="" multilingual="1" />

Basically I want to allow some simple HTML styles, e.g. <strong></strong> 

I have been trying to find the answer in the docs, e.g. https://www.elxis.net/docs/developers/libraries/elxisparameters.html
Apologies if it's already explained somewhere in the docs.