--- Manuel Mall <[EMAIL PROTECTED]> wrote:

> On Wed, 2 Nov 2005 01:03 am, Chris Bowditch wrote:
> > Manuel Mall wrote:
> > > Currently if one puts a zero-width-space
> (U+200B) into an XSL-FO
> > > file (or specifies
> linefeed-treatment="treat-as-zero-width-space")
> > > it is rendered as a "missing character" in PDF.
> Is that correct,
> > > i.e. does this character have to exist in the
> font used or should
> > > the formatter or renderer simply remove this
> character? It is the
> > > second approach that both AntennaHouse and
> RenderX appear to have
> > > chosen.
> >
> > I recommend that no character is output for a ZWS.
> The whole purpose
> > of placing a ZWS into the input XSL-FO is to give
> layout an extra
> > break opportunity, without changing the appearance
> of the generated
> > document.
> >
> That seems to be the consensus, that is consider ZWS
> for line breaking 
> but then discard and don't give it to the renderers.
> 
> Are there any other (unusual Unicode) characters
> which fall in the same 
> category that is they influence layout decisions but
> should not be seen 
> by the renderers?
> 
> > Chris
> 
> Manuel
> 

According to UAX#14, this characters is invisible too
00AD SOFT HYPHEN (SHY)
2060 WORD JOINER (WJ)
FEFF ZERO WIDTH NO-BREAK SPACE (ZWNBSP)

Jingjing



        
                
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