Guenter Milde wrote:

> Thinking about it while writing aastex6.layout, there is a major
> disadvantage of the "old loads new" approach:
> 
> * aastex6.layout inputs aastex.layout and currently only changes the name
>   and referenced LaTeX class file.
>   
>   I future, it should also support commands new in aastex v. 6.
>   
>   Adding new styles to aastex6.layout is simple and does not require any
>   changes to the old aastex.layout.
>   
>   OTOH, if the old aastex.layout would input the new aastex6.layout, any
>   adding of a new style there would require a new "NoStyle" in the old
>   layout.
>   
>   
> Generally, as the old layout is stable but the new a "moving target", the
> method "new loads old" is preferable, as this allows to keep "old" at the
> proven status. (This is als important, because we usually do not test with
> obsolete LaTeX classes/packages.)

Very good point. For me personally this is the killer argument for always 
doing "new loads old".


Georg

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