Unit SS, Part A: PAT, Introduction

3 types of text searching: use

• cluster trees
• hashing
  • signature files, MPHFs
• sorted indexes
  • inverted files
  • PAT trees and arrays

Model of text collection

• Single string
• Position = sistring
• Match can refer to structures too:
  • doc Ch including "PAT Array"

Query language

• See PAT User's Guide and the Quick Reference Guide
• Strings: exact, regexp, context
• Ranges, Proximity conditions
• Boolean operations, Sets
• Frequent text, Repetitions