RoundToString(value) 

Rounds a value to an integer and converts to a string; useful for initializing an attribute with a sequence number.

Concatenate(value1,value2)

Concatenate two strings without a space. The string may be "quoted text," another attribute, or RoundToString. The value list may contain up to four arguments.

Combine(value1,value2)

Combine two strings with a separating space.

CombineWithDelimiter("delimiter",value1,value2)

Combine two strings with a delimiting character or string.