Can you please provide a very detailed explanation of ZPL (Zebra Programming Language) and its applications in the technology industry? How is ZPL used in various sectors such as logistics, healthcare, and retail? What are the key features and benefits of ZPL? How does it improve efficiency and accuracy in barcode printing and label design? Can you also explain the syntax and structure of ZPL code? Additionally, please provide insights into the future prospects of ZPL and its role in the advancement of printing and labeling technologies.