This is a slightly version of other question posted here: http://stackoverflow.com/questions/2888880/xslt-change-node-inner-text

Imagine i use XSLT to transform the document:

<a>
  <b/>
  <c/>
</a>

into this:

<a>
  <b/>
  <c/>
  Hello world
</a>

In this case i can't use neither the

<xsl:strip-space elements="*"/> 

element or the [normalize-space() != ''] predicate since there is no text in the place where i need to put new text. Any ideas? Thanks.