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The following page has been changed by AndreasDelmelle:
http://wiki.apache.org/xmlgraphics-fop/PropertyHandling/PropertyCache

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  Note: a fact overlooked by many is that, according to the XSL-FO 
Recommendation, '''any''' property may be specified on '''any''' formatting 
object. The fact that the font-size property does not apply to {{{fo:root}}} 
still does not mean that the property will be entirely lost. Due to regular 
inheritance, '''all''' {{{PropertyList}}}s will ultimately use the value of the 
root {{{PropertyList}}} unless an override is provided on a deeper level.
  
- Still, sometimes this type of streamlining of the stylesheet is not always 
possible. In contexts where the stylesheet is generated by a third-party tool, 
there are likely to be many XML attribute specifications that, from the point 
of view of the formatter would be redundant. On another note, there are also 
many {{{<enum>}}} properties that share the same possible values, but are not 
inherited.
+ Still, this type of streamlining of the stylesheet is not always possible. In 
contexts where the stylesheet is generated by a third-party tool, there are 
likely to be many XML attribute specifications that, from the point of view of 
the formatter would be redundant. On another note, there are also many 
{{{<enum>}}} properties that share the same possible values, but are not 
inherited.
  
  The initial idea for further optimization in that area was given to FOP by 
Richard Wheeldon in a Bugzilla patch (see: 
https://issues.apache.org/bugzilla/show_bug.cgi?id=41044).
  

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