[Proj] C++ coding practices w.r.t object ownership

Martin Desruisseaux martin.desruisseaux at geomatys.com
Sun May 27 11:05:14 EST 2018

Hello Even

Thanks for this first draft, it looks promising!

One quick comment: it may be worth to move CI_Citation, EX_Extent and
MD_Identifier, currently in "common", to their own "metadata" package.
The reason is that even if they are currently the main ISO 19115
structures of interest for Proj, in the future GDAL may be interested in
more ISO 19115 metadata structures (e.g. GeographicBoundingBox,
SampleDimension, CoverageDescription, etc.).


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