What are the steps in the instantiation of a template? - XSLT

What are the steps in the instantiation of a template?

- The template can be instantiated using the source element of the tree and it can create some part of the result tree.

- The template can consist of elements using the XSLT namespace that provides the instructions for creating the fragments.

- After the template instantiation the instructions are executed using the tree fragments.

- The instructions are processed and it is descendant of the source elements that consists under the source tree.

- Processing the elements in the source tree creates a result tree fragment on which template rule can be applied.