region.inner.extent
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## region.inner.extent

region.inner.extent — Specifies the width of the inner side region

## Synopsis

    <xsl:param name="region.inner.extent">0in</xsl:param>

## Description

The region inner extent is the width of the optional text area next to the inner side (binding side) of the body region.

For double-sided output, this side region is `fo:region-start` on a odd-numbered page, and `fo:region-end` on an even-numbered page.

For single-sided output, this side region is `fo:region-start` for all pages.

This correspondence applies to all languages, both left-to-right and right-to-left writing modes.

The default value of this parameter is zero. If you enlarge this extent, be sure to also enlarge the `body.margin.inner` parameter to make room for its content, otherwise any text in the side region may overlap with the body text.

See also `region.outer.extent`, `body.margin.inner`, `body.margin.outer`, `side.region.precedence`.

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