Can’t thank you enough @EricShulman
EricShulman:
When referencing tiddler contents within filter syntax:
The delimiters surround the filter operand indicate how the operand is to be processed:
square brackets – [text]– surround literal text
angle brackets – <variablename> – surround variable references
curly braces – {tiddlername}, {!!fieldname}, or {tiddlername!!fieldname} – surround tiddler field references
Note that, while doubled delimiters – [[tiddlerlink]], <<variablename>>, or {{fieldreference}}– are used within regular wikitext, single delimiters – [text], <variablename>, or {fieldreference} – are used within filter syntax.
I did notice these syntax differences and wondered about their significance when going through macros from other experts. Great explanation. You answered my several questions with one shot.
I am trying to customize journal-book macro . @EricShulman answer removed the roadblock.