is it possible to create a custom widget in UiBinder that can contain unknown number of child elements

is it possible to create a custom widget in UiBinder that can contain
unknown number of child elements ?

similar to FlowPanel and HTMLPanel.

for example, how to create a MyContainer, that can contain One or More
Hyperlinks ?

<my:MyContainer>
<g;HyperLink ui:field="a" />
<g;HyperLink ui:field="b" />
<g;HyperLink ui:field="c" />
....
<g;HyperLink ui:field="n" />

</my:MyContainer>

reading the documentation, I noticed there are @UiFactory and
@UiConstructor, but I believe
they are useful when we have number of attributes.
for example
<my:MyContainer attr1="a" attr2="b" .. attrN="n"/>

how can we do similar with child elements ?
how can <my:MyContainer> gain access to its child elements ?

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