在HLA的使用手册中，明确定义了HLA这种语言：
“A "high level assembly language" (HLAL) is a language that provides a set of statements or instructions that practically map one-to-one to machine instructions of the underlying architecture. The HLAL exposes the underlying machine architecture including access to machine registers, flags, memory, I/O, and addressing modes. Any operation that is possible with a traditional assembler should be possible within the HLAL. In addition to providing access to the underlying architecture, the HLAL must provide some abstractions that are not normally found in traditional assemblers and that are typically found in traditional high level languages; this could include structured control statements (e.g., if, for, and while), high level data types and data structuring facilities, extensive compile-time language facilities, run-time expression evaluation, and standard library support. A "High Level Assembler" is a translator that converts a high level assembly language to machine code.”
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