XPat Query Language

• XPat Syntax and Usage
• Invocation
• Points
• the “history” command
• Regions
• element-T regions
• A-atrribute regions
• Identifying Sets (PSets & RSets)
• Operators
• Using the Operators to Make Sets of Interest
• Viewing the Sets
• {quieton raw} mode and programming XPat queries in Perl
• tagged results
• handled by XPatResultSet object