IS num or Str?

Hi,
I look for a command to determine whether a label is string or not? in my scheduled source, I have a combination of num and strings (This would be possible if u copy them from an Excel sheet OR simply change the node type by right clicking the cell). the strings in my case are some numbers sperated by "\" (say, "4\12\3")
thanks,

Here's the test:

getdatatype(label(<object>,<labelname>))==DATATYPE _NUMBER

or test for DATATYPE_STRING.

You can also use nodeadddata(<node>,<predefined_type>)