I give symbolic names to each cfengine configuration section we handle specifically , and these symbolic names are used throughout the cfperl source code instead of string constants 我用符号名称为每个专门处理的cfengine配置节命名，这些符号名称可以在整个cfperl源代码中使用，而不仅限于字符串常量。
The constant must have a valid symbolic name the rules are the same as those for creating variable names and an expression composed of numeric or string constants and operators but no function calls 常数必须具有一个有效的符号名称和一个由数值或字符串常数及操作（但不包括函数调用）构成的表达式，其中符号名称的命名规则与变量命名规则相同。
