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

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

The comment on the change is:
Some clarifications about spaces and borders

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  '''Legend:'''
  
   * lh = line height
+ 
+ = Spaces and Conditional Lengths - an Overview =
+ 
+ Both spaces and conditional lengths (borders and padding) have conditional elements but they behave a little differently. For spaces the conditionality ''controls whether a space-specifier has effect at the beginning or end of a reference-area or a line-area'' (XSL 1.0, 4.3). For padding and borders the conditionality controls ''if the padding should be 0 or retained if its associated edge is a leading-edge in a reference-area for areas generated from this formatting object that have an is-first (or is-last) value of "false"'' (XSL 1.0, 7.7.9 and 7.7.31). The difference: While the conditionality applies to every space-specifier regardless of the is-first/is-last status of the generated area, it does matter for conditional lengths where the conditionality only applied if it's not the first or last generated area by a formatting object.
+ 
+ Like border and padding, space-before and space-after apply to every area generated by a formatting object, not just the first and the last (XSL 1.0, 7.10.5). This is further illustrated by the general area model described in XSL 1.0, 4.2.3.
  
  = General pattern for the Knuth layout system =
  

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