Difference between "normalize" and "canonicalize"?

Hi Folks,

Consider these two sentences:


1. When an XML parser reads in an XML document it normalizes all line breaks to \n.  

2. A canonicalizer tool will canonicalize empty elements to start-tag, end-tag pairs.


Both "normalize" and "canonicalize" seem to mean:

   Put into a standard form.

Do they in fact mean the same thing? If so, why have two terms? Why not have just one term?

/Roger