[tw5] Using <$list> widget to generate table rows

[Louis Davout]

I'm trying to use the <$list> widget generate table rows. One is this even 
possible. Two How? Here is simplified version of code I've tried. 

\define davout-list(levels: "1,3,5")
| ! Level | ! Blah |
<$list filter="[[$levels$]split[,]]" variable="level">
| <<level>> | Blah |
</$list>
\end

\define davout-list2(levels: "1,3,5")
| ! Level | ! Blah |
<$list filter="[[$levels$]split[,]]" variable="level">
| <<level>> | Blah |
<$wikify name=wikifiedRow text=| <<level>> | Blah |>
<<wikifiedRow>>
</$wikify>
</$list>
\end

<<davout-list>>

<<davout-list2>>

The html it generates:
<table><tbody><tr class="evenRow"><th align="center"> Level</th><th 
align="center"> Blah</th></tr></tbody></table><p>
| 1 | Blah |

| 3 | Blah |

| 5 | Blah |
</p><table><tbody><tr class="evenRow"><th align="center"> Level</th><th 
align="center"> Blah</th></tr></tbody></table><p>
| 1 | Blah |
&gt; | Blah |&gt;
|


| 3 | Blah |
&gt; | Blah |&gt;
|


| 5 | Blah |
&gt; | Blah |&gt;
|

</p>

It's closing the table and generating <p> tags.
---------------------------------------------------------
A more general question. It's been stated that macros are text substitution 
not functions that return a value. And they don't "evaluate". I've seen 
first hand they don't return a value, but they do seem to at least execute 
some code. For example they do call other macros:

\define a()
<<b "here">>
\end

\define b(where)
$where$
\end

<<a>>

produces:
here

So what are the rules for what macros will and will not "execute"?

Thanks.

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