From the Eliovir
Q Where is the difference between round and square brackets in combined conditions?
Q Can specific attachments be tested for existence?
eg (:if attachments descriptor='*.jpg,*.jpeg':)
see ConditionalMarkupSamples
Q Can attachments on a specific page be tested for existence?
eg (:if attachments Group.PageName:)
Q Can a numerical expression be tested for?
eg
(:if {(strlen "{$:Summary}")} < 20:)
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