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Backward compatibility

Old versions of CLASS (i.e. older than apr11g) will just ignore the user section, if it exists. This section will be lost in a GET-and-WRITE process.

Starting from apr11g, CLASS is able to detect, load and give basic details about this section. All the user subsections are preserved and written to the output file, under the restrictions exposed in the next section.

Gildas manager 2014-07-01