Support dymic template

<div children="@load(vm.elements)@template(each.span?'span': 'div')" >
    <template name="div">
        <div/>
    </template>
    <template name="span">
        <span/>
    </template>
</div>

<div content="@template(vm.element.span?'span': 'div')" >
    <template name="div">
        <div/>
    </template>
    <template name="span">
        <span/>
    </template>
</div>