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Attribute: grouping-size (of element <number>)

Standard excerpt:

The grouping-separator attribute gives the separator used as a grouping (e.g. thousands) separator in decimal numbering sequences, and the optional grouping-size specifies the size (normally 3) of the grouping. For example, grouping-separator="," and grouping-size="3" would produce numbers of the form 1,000,000. If only one of the grouping-separator and grouping-size attributes is specified, then it is ignored. Examples (xslt:xml): Overview
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Interactive xlab: