[Kst] kdeextragear-2/kst/devel-docs

[George Staikos]

CVS commit by staikos: 

a few lines of documentation saves two wasted hours reading code and writing
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  M +15 -0     KstPlugins   1.5


--- kdeextragear-2/kst/devel-docs/KstPlugins  #1.4:1.5
@@ -82,2 +82,17 @@
 </curvehints>
 
+
+
+Filters
+-------
+
+Filters are plugins that process a given input vector (along with one or more
+auxiliary vectors and scalars), and produce an output vector (along with one
+or more auxiliary vectors and scalars).  The production of the output vector
+from the input vector is considered to be the main action of the plugin, and
+this simple definition allows filters to be easily added to vectors on the fly.
+A filter is marked by adding the following node to the intro node of the XML
+file:
+
+<filter input="input_vector_name" output="output_vector_name" />
+