The "pragma" can be switched off or switched on selectively as others have 
indicated. This can be done inside macros or applied to a single tiddler on 
its own via \rules.

TonyM also pointed out that you can also globally selectively toggle many 
of the pragma in settings.

I agree it can be helpful to understand what is going on with them. A major 
purpose is many (most?) do the basic parsing of raw content of Tiddlers 
into rendered HTML.

They have been of much interest to me because I do a lot of work using TW 
to process and auto-convert non-standard text formats. 

It is in fact possible to access the TW process prior to the standard 
pragma. This can give you amazing flexibility in combining ad-hoc text 
changes for "pre-conversion" of non-standard text formats that then are 
further processed using the standard parsers.

I mention this because its given me quite a lot understanding of pragma in 
TW. Note that Content Types can define which pragma to run and offer ways 
you can make new pragma. Its possible to make new Content Types.

The best resources I know about this are from BJ's work ...

Flexitype ... http://bjtools.tiddlyspot.com/#Flexitype%20Demos

Flexity ... http://flexibility.tiddlyspot.com/

Here are discussions that may shed a bit of light on this largely 
undocumented topic ...

https://groups.google.com/forum/#!msg/tiddlywiki/bl_GiI63X84/_naCQEG1AAAJ

https://groups.google.com/forum/#!searchin/tiddlywiki/pragma$20jeremy%7Csort:date/tiddlywiki/A7vdxcRb8lQ/yycBBydIEwAJ

Best wishes
Josiah

S. S. wrote:
>
> On tiddywiki.com I read the tiddler: Pragma 
> <https://tiddlywiki.com/#Pragma> but I didn't really understand what 
> \rules could do.
> In the tiddler: Using Stylesheets 
> <https://tiddlywiki.com/#Using%20Stylesheets> it has this:
> \rules only filteredtranscludeinline transcludeinline macrodef 
> macrocallinline html
>
> Is there a place that explains:
> 1) What are *all* the different \rules.
> 2) How are they used (what do they do)?
>
> If not, it would be useful to know.
>
> Thanks!
>
>

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