Here are some of the features and notes about PmWiki's design decisions. Many of these derive directly from the PmWikiPhilosophy and lots of discussion on the mailing lists.

• PmWiki:FlatFileAdvantages - why PmWiki uses flat files to store pages instead of an SQL database
• PmWiki:HierarchicalGroups - why PmWiki doesn't support nested groups
• PmWiki:PageLocking - how PmWiki works without locking pages (see also simultaneous edits)
• PmWiki:SearchImprovements - why PmWiki has a native search engine
• PmWiki:FilePermissions - some information about PmWiki's file permission settings

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