| Description | All meta-modelling items - properties, meta-classes etc. - have descriptions attached.
These can be specified in two ways:
- as a description property (description="...")
- as one or more nested description elements - '<description>...</description>'.
The getDescription() method on items returns:
- the description property, if one has been specified, or if not...
- the aggregated text of all the embedded <description> nested elements if at least one has been specified, or if not...
- null.
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