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Technical Overview
  internal package Foswiki::Contrib::MailerContrib::Subscription  
Object that represents a subscription to notification on a set of pages.
A subscription is expressed as a set of page specs (each of which may
contain wildcards) and a depth of children of matching pages that the
user is subscribed to.
 ClassMethod new($pages, $childDepth, $options) 
  
Create a new subscription.
 stringify() → string 
Return a string representation of this object, in WebNotify format.
 ObjectMethod matches($topic, $db, $depth) → boolean 
 
-  $topic- Topic names we are checking (may be an array ref)
-  $db- Foswiki::Contrib::MailerContrib::UpData database of parent names
-  $depth- If non-zero, check if the parent of the given topic matches as well. undef = 0.
 
Check if we match this topic. Recurses up the parenthood tree seeing if
this is a child of a parent that matches within the depth range.
 ObjectMethod covers($other, $db) → $boolean 
  
Return true if this subscription already covers all the topics
specified by another subscription. Thus: 
-  AA;B covers AB, AxB
-  AA; covers AA;B
-  A;B does not cover AA;
 ObjectMethod filterExact( \@pages ) → $boolean 
If this subscription has an exact (string) match to any of the page expressions passed,
remove it and return true.
    * \@pages - list of page expressions to filter
 ObjectMethod getMode() → $mode 
Get the newsletter mode of this subscription ('', '?' or '!') as
specified in 
WebNotify.
 ObjectMethod equals($other) → $boolean 
Compare two subscriptions.