I am removing the part about the standalone WKT to be discussed in another 
issue. 

Proposed WKT string statement modifications (modifications in italics):
>There will be occasions when a given CRS property value is duplicated in both 
>a single-property grid mapping attribute and the crs_wkt attribute. In such 
>cases the onus is on data producers to ensure that the property values are 
>consistent. There will be occasions when a given CRS property value is 
>duplicated in both a single-property grid mapping attribute and the crs_wkt 
>attribute. In such cases the onus is on data producers to ensure that the 
>property values are consistent. *If both a crs_wkt and grid mapping attributes 
>exist, it is assumed that they do not conflict. As such, information from 
>either one (or both) may be used to represent the CRS of the file, recognizing 
>that the grid mapping parameters should always be completed as fully as 
>possible.* ~~However, in those situations where two values of a given property 
>are different, then the value specified by the single-property attribute shall 
>take precedence. For example, if the semi-major axis length of the ellipsoid 
>is defined by the grid mapping attribute semi_major_axis and also by the 
>crs_wkt attribute (via the WKT SPHEROID[…​] element) then the former, being 
>the more specific attribute, takes precedence. Naturally if the two values are 
>equal then no ambiguity arises.~~

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