Documentation for multiple filter operands (#4969)

editions/tw5.com/tiddlers/filters/Introduction to filter notation.tid

@@ -1,5 +1,5 @@
 created: 20140410101941871
-modified: 20150228104558000
+modified: 20201103111438568
 tags: Learning Filters
 title: Introduction to filter notation
 type: text/vnd.tiddlywiki
@@ -85,3 +85,10 @@ In this simplest form the TextReference will take the full content of the tiddle
 > `[search<currentTiddler>]`
 
 Note that these special brackets cannot be nested. It is not possible for example to write `[search{<currentTiddler>}]`.
+
+!Multiple parameters
+
+<<.from-version "5.1.23">> Some steps accept multiple parameters which are separated by a ` , ` character.
+
+> Example: `[param1],[param2]` or `<param1>,{param2}`
+

editions/tw5.com/tiddlers/filters/syntax/Filter Parameter.tid

@@ -1,5 +1,5 @@
 created: 20150220152540000
-modified: 20150220152540000
+modified: 20201103110920722
 tags: [[Filter Syntax]]
 title: Filter Parameter
 type: text/vnd.tiddlywiki
@@ -25,3 +25,7 @@ The parameter to a [[filter operator|Filter Operators]] can be:
 : <<.def variable>>
 :: `<like this>`
 :: The parameter is the current value of the [[variable|Variables]] whose name appears between the angle brackets. Macro parameters are <<.em not>> supported.
+
+<<.from-version "5.1.23">> Filter operators support multiple parameters which are separated by a ` , ` character.
+
+For example: `[param1],[param2]` or `<param1>,{param2}`

editions/tw5.com/tiddlers/filters/syntax/Filter Step.tid

@@ -1,5 +1,5 @@
 created: 20150124182127000
-modified: 20150124191051000
+modified: 20201103111044922
 tags: [[Filter Syntax]]
 title: Filter Step
 type: text/vnd.tiddlywiki
@@ -18,4 +18,6 @@ The step's <<.def operator>> is drawn from a list of [[predefined keywords|Filte
 
 The <<.def suffix>> is additional text, often the name of a [[field|TiddlerFields]], that extends the meaning of certain operators.
 
-Many steps require an explicit <<.def parameter>> value, also known as an <<.def operand>>, that further defines what the step is to do.
+Many steps require an explicit <<.def parameter>> value, also known as an <<.def operand>>, that further defines what the step is to do. 
+
+<<.from-version "5.1.23">> Some steps accept multiple parameters which are separated by a ` , ` character.