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kotlinlang

I'm looking at kotlinx-html to learn about making DSL's and I've encountered some syntax that I can't figure out.  Namely,
```open class DIV(initialAttributes : Map&lt;String, String&gt;, override val consumer : TagConsumer&lt;*&gt;) : HTMLTag("div", consumer, initialAttributes, null, false, false), HtmlBlockTag {

}
```
I think I get it all up to the point where there's a comma --
```
, HtmlBlockTag {

}
```
Could anyone point me to kotlin references that explain what is going on here?