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The chart tag library is a collection of JSP tags for creating charts to visualize both search results (document result sets) and facets.

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Usage

You can visualize your data using the charts markup language. As an example, let us say you want to plot distinct segments of a search response facet as a chart, with each segment shown in proportion to size of that segment. For this you would add the Chart Display tag to your page, passing in a reference to the twigkit.model.Response containing the facet you want to plot and specify the facet name and type of chart you want to render. For example: 
<chart:display response="response" facet-name="current_products" title="Current Products" type="pie"></chart:display>
In some cases, you might want to specify more options for your chart, or provide multiple data series to plot, for example. You do that by opening the chart:display tag and providing one or more chart options or tags in the markup body: 
<chart:display response="response" title="Current Products">
    <series:facet name="current_products" type="column" title="Current Products"></series:facet>
    <chart:tooltip header-format="<b>{point.x}</b><br/>" point-format="{series.name}: <b>{point.y}</b><br/>"></chart:tooltip>
</chart:display>