[Xmlgraphics-fop Wiki] Update of "HowToCreateLayoutEngineTests" by JeremiasMaerki

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The following page has been changed by JeremiasMaerki:
http://wiki.apache.org/xmlgraphics-fop/HowToCreateLayoutEngineTests

The comment on the change is:
Added "tolerance" value

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  Format:
  {{{
- <eval expected="[expected value]" xpath="[XPath expression]"/>
+ <eval expected="[expected value]" xpath="[XPath expression]" tolerance="[optional number]"/>
  }}}
  
- This is similar to the first check, but here you can specify an expected value the XPath expression has to result into. Generally you get a more descriptive error message if such a test fails than with "true".
+ This is similar to the first check, but here you can specify an expected value the XPath expression has to result into. Generally you get a more descriptive error message if such a test fails than with "true". You can use the optional "tolerance" value to specify a tolerance for number comparisons.
  
  === element-list ===
  

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