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Available since OmniFaces 1.2

The <o:outputFormat> is a component that extends the standard <h:outputFormat> with support for capturing the output and exposing it into the request scope by the variable name as specified by the var attribute.

You can use it the same way as <h:outputFormat>, you only need to change h: into o: to get the extra support for var attribute. Here's are some usage examples:

<o:outputFormat value="#{i18n['link.title']}" var="_link_title">
    <f:param value="#{bean.foo}" />
    <f:param value="#{bean.bar}" />
</o:outputFormat>
<h:commandLink value="#{i18n['link.value']}" title="#{_link_title}" />
<o:outputFormat value="#{bean.number}" var="_percentage">
    <f:convertNumber type="percent" />
</o:outputFormat>
<div title="Percentage: #{_percentage}" />

Make sure that the var attribute value doesn't conflict with any of existing variable names in the current EL scope, such as managed bean names. It would be a good naming convention to start their names with _.

Demo

Check the tooltip.

Demo source code
<o:outputFormat value="some {0} i18n {1} bundle {2} text" var="_title">
    <f:param value="one" />
    <f:param value="two" />
    <f:param value="three" />
</o:outputFormat>
<p title="#{_title}">Check the tooltip.</p>
Documentation & Sources