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Available since OmniFaces 4.5
The <o:link> is a component that extends the standard <h:link> and allows including the request query string parameters of the current URL into the link's target URL. Standard Faces <h:link> does not include any query string parameters which are not declared as view parameters. This is particularly useful if you expect some state in the target page and don't want to repeat <f|o:param> all over place.
You can use it the same way as <h:link>, you only need to change h: to o:.
Include request params
When you want to include request query string parameters of the current URL into the link's target URL, set the includeRequestParams attribute to true.
<o:link value="Go to some page with same query string" outcome="some-page" includeRequestParams="true">Documentation & Sources