Key sections: PDF Type detection — Vector vs Scanned, different extraction strategy for each Step-by-step workflow — 6 steps from file organization to discrepancy report Visual symbol table — per ELV system (CCTV, FAS, ACS, PA, SC, IPTV, etc.) Best practices — legend-first, one device type at a time, grid method, typical floor check Confidence rating — High / Medium / Low per drawing
