求助QUOTE簇函数

1. %macro a;
   
2. %let AVO=COUNTRY STATGR1;
   
3. %let AVL=Sequence Number|Reported Name of Drug, Med, or Therapy;
   
4. %let AVN=%eval(%sysfunc(count(%quote(&AVL),%str(|)))+1);
   
5. 
   
6. data adcm;
   
7.     %do i = 1 %to &AVN.;
   
8.         attrib %scan(&AVO,&i.) label="%trim(%scan(%quote(&AVL),&i.,%str(|)))";
   
9.     %end;
   
10. 
    
11. run;
    
12. %mend;
    
13. 
    
14. %a;

复制代码

请问上面程序中的红字部分为什么报错呢？

还有，请问能否提供几个扼要实例说明下%str，%quote和%bquote间的差别，谢谢。：）

http://blog.sina.com.cn/s/blog_bfa930890101d4gl.html

Problem is: "%trim(%scan(%quote(&AVL),&i.,%str(|)))"; it works to correct as:
"%trim(%quote(%scan(%quote(&AVL),&i.,%str(|))))";

没看到红色部分。

farmman60 发表于 2013-12-17 07:58
Problem is: "%trim(%scan(%quote(&AVL),&i.,%str(|)))"; it works to correct as:
"%trim(%quote(%scan(% ...

Thanks , And I have just found some examples for function QUOTE here:

http://blog.sina.com.cn/s/blog_bfa930890101d4gl.html