Mime types clarification

[MURATA Makoto (FAMILY Given)]

Dear colleagues,

> application/vnd.openxmlformats-officedocument.presentationml.presentation	pptx
> application/vnd.openxmlformats-officedocument.presentationml.slide	sldx
> application/vnd.openxmlformats-officedocument.presentationml.slideshow	ppsx
> application/vnd.openxmlformats-officedocument.presentationml.template	potx

What is the differences between these four media types?  Are all of them
PresentationML documents?  Are they syntactically the same but do they
have different roles?

> application/vnd.openxmlformats-officedocument.spreadsheetml.sheet	xlsx
> application/vnd.openxmlformats-officedocument.spreadsheetml.template	xltx

Again, what is the differences between these two?  Are both
SpreadsheetML documents?

> application/vnd.openxmlformats-officedocument.wordprocessingml.document	docx
> application/vnd.openxmlformats-officedocument.wordprocessingml.template	dotx

Again, what is the differences between these two?  Are both
WordprocessingML documents?

Cheers,
Makoto