Question about DocBook, FOP, inlinegraphic and vertical align

[Andrea Mattioli <aldaris@jumpy.it>]

Dear Sir/Madam,
I have a question about how to obtain a vertical alignment using
DocBook.

I have created an xml docbook "doc" like the following and I
would like that the image, on the same line of the title,
is aligned vertically respect to the title itself.

<
book
>

        

<
bookinfo
>

                 

<
title
>

                          

<
inlinegraphic

fileref
="logo.jpg
"

width
="3cm
"

scalefit
="1
"

valign
="middle
"/>
TITLE
</
title
>

        ...

I'm using XALAN and FOP to transform the "doc" and I obtain the following block:

<
fo:block

font-family
="
sans-serif,Symbol,ZapfDingbats
"

font-weight
="bold
"

font-size
="24.8832pt
"

text-align
="center
"

space-before
="18.6624pt
">

        

<
fo:block

hyphenate
="false
"

keep-with-next.within-column
="
always
">

                 

<

fo:external-graphic

src
="url(logo.jpg)
"

width
="3cm
"

height
="auto
"

content-width
="scale-to-fit
"

content-height
="scale-to-fit
"

display-align
="center
"/>
TITLE
</
fo:block
>

        

</
fo:block
>
...

But in this way
TITLE is then rendered at the baseline of the graphic. I have noticed
that if I specify the attribute
vertical-align
="
middle
" in

fo:external-graphic

<
fo:external-graphic

src="
url(logo.jpg)
"

width="
3cm
"

height="
auto
"

content-width
="scale-to-fit
"

content-height
="scale-to-fit
"

display-align
="center
"

vertical-align
="middle
"/>
TITLE
</
fo:block
>

then the result using FOP is the
desired one. I also noticed that in file "graphics.xsl" valing
sets the attribute
display-align
="
center
".

How I can set in "doc.xml" the right tag to obtain
vertical-align
="
middle

" ? Is it a problem of the DocBook stylesheet or a FOP problem ?

Thank you.
Best regards,
         Andrea.