[Therion] Tags/Attr split from [Extended elevation control - Embedded image does not appear in some layouts]

[Andrew Atkinson]

On 19/02/2025 17:02, Benedikt Hallinger wrote:
 > 2. tagged elements only if they are selected in the thconfig
 >
 > 3. actual systematic is user-defined, so we have maximum flexibility.
 > For example, I could imagine mixing several systematics, one for desired
 > output scale and another for special purposes:
 >
 > --------- thconfig --------
 > select tag scale:250
 > select tag scale:500
 > select tag remarks
 > select tag crossSections:abc
 > export map ....
 > ---------------------------
 > In the th2's I just tag the items with "-tag scale:500" or "-tag
 > crossSections:abc" (or both).
 > This would completely (and optionally) decouple the show/hide from
 > internal magic and support various usecases out of the box. One just
 > needs to think of a good tagging systematic for his usecases/dataset.


I agree the attr so nearly does this, you can set attr like
-attr scale 250
-attr crossSection abc
However, it is not exposed to the select or the symbol-hide/show. It 
appears to be only accessible from metapost and the database export (the 
thbook also says it is exported in shape files)

Andrew