UCM13 — Rephrase some explanations

There are some inconsistencies in the first sections of the document.
For example, section 1.4 is entitled “Programming model” while section 14 is entitled “UCM container model”.
Also, section 9.1.2 mentions “properties”, which do not seem to be defined in the rest of the document.

Rephrase some explanations

Some terms (e.g. “properties” or “programming model”) had been used in the early stages of the standard, but are have not been used in the final version of the document. Replace these obsolete terms with the correct ones.