It can be omitted (under normal circumstances)
I was/am using it because I combine/d different observations from different weewx databases
with different rain gauges into one graph/picture.
I think the image generator needs to be told from where to take the data if more than one observation is under the e.g. [[[dayrainx]]] stanza in several [[[[nnnn]]]] stanzas taking data from different databases
(plus it increases the readability of the code 😎)

On 28.06.2023 01:22, Greg Reive wrote:
I don't think you need that line. Just comment it out.
I was playing with lots of options and forgot to remove that line.


On Wed, 28 Jun 2023 at 09:16, DR <[email protected]> wrote:

    I'm trying to learn how to do a fwe things, but am confused by the
    need
    for the data_binding statement:


    > data_binding = wx_binding


    Isn't this a default linkage, and for those of us with simple
    databases
    and setups, not needed?  Just trying to cipher this out.

    Thanks for any explanation.  Dale


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