Difference between import and include

Hi,
Can some one tell me the difference between include or import?
Basically I was wondering that is it possible to use either one of the xsl:
commands to inlude or import a spcific xsl template at a particular point in
the xsl file,kind of like calling a method inside of a method e.g

function mainXSLT(){
 print some stuff
 print some other stuff
 call the include or import able xsl file
 print some other stuff

}
Thanks in advance
Khalid

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