For developers coming from a web developer perspective (HTML) it would be good to support XML declarations that are using lower-case-dashed syntax (aka kebap-case). Here is an example:

<page>
  <scroll-view>
    <stack-layout>
      <label cssClass="title" text="Layouts" />
      <stack-layout>
        <button tag="layouts/stack-layout" text="StackLayout" tap="itemTap" />
...

Possible technical implementations:

1. Split by Capital case. Ex:
   Button - button
   MyButton - my-button
   MySuperButton - my-supper-button
2. Add a decorator to the component class. Ex:

@Component({tagName: 'button'})
export class Button extends view.View implements definition.Button {