Table of Contents About This Document 1        Introduction. 1 2        Language Concepts 21 3        Identifiers 37 4        Conditions 43 5        Time Expressions 53 6        Rules 77 7        Cache-Based Event Correlation. 87 8        Message and Command Queues 91 9        Listeners 95 10      Commands 101 11      Prefix Commands 142 12      Source File Directives 147 13      Symbolic Substitution. 151 14      API Functions 159 15      Expert Skill Module API 182 Appendix A. Special Symbols 201 Appendix B. Cron Schedules 205 Appendix C. Sample Scripts 207 Appendix D. Sample Skill Modules 213 GNU Free Documentation License. 219

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