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/units.xsl, modules/objects.xsl

Used by:

f:parse-length(), f:object-width(), f:object-height(), f:object-contentwidth(), f:object-contentheight()

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 barleycorns^⌖² 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.