<html><head><style type="text/css"><!-- DIV {margin:0px;} --></style></head><body><div style="font-family:times new roman,new york,times,serif;font-size:12pt">hi, I'm using <span style="font-style: italic;">v.extract</span> where I can put the option <span style="font-style: italic;">where, </span>my question is that from where do I know what are the attributes that I can query on.<br>How to do that inside grass without the need to check the files externally.<br><br>thanks,<br></div><br>
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