## f:empty-length

f:empty-length — Returns a map that represents an empty length.

Function:
{http://docbook.org/ns/docbook/functions}empty-length#0
Defined in:
modules/units.xsl
Used in:
modules/objects.xsl

## Synopsis

 f:empty-length( ) as `map(*)`

## Description

Lengths are compound objects. Lengths consist of a magnitude (a number) and a unit: 3 inches, for example, or 11.9 barleycorns2 in the case of absolute lengths. For relative lengths, the unit is something relative like percent.

These are represented as maps internally and `f:empty-length()` returns a length with no magnitude or units.