The templates have a selection part (LHS of the reduction rule) and construction part representing the RHS of the rule
Selection part: the attribute match
Construction part: the body of the template
element
The own transformation then means that XSLT interpreter (XSLT processor, an XSLT engine) takes the input nodes of the document, it looks to their appropriate templates - according to the match clause and produces a result corresponding to construction content of this template.