spantaut

5reg

spantaut

Does an angle structure list span a taut structure?

Content Model
    spantaut ::=
Attributes
Name | Type
`value` | `CDATA` (required)

&eltaddedver;4.90

## Description

A &xml-spantaut; element stores whether or not any angle structure in the parent list is a taut angle structure. Because taut structures always appear as vertices of the angle structure solution space, this is equivalent to knowing whether any convex combination of the angle structures in the parent list is a taut angle structure.

A taut angle structure contains only angles 0 and π.

### Parents

The following elements contain `spantaut`:

- &xml-angles;

.

### Children

Element `spantaut` has no children.

## Attributes

`value`

- Either `T` or `F`, according to whether the parent list does or does not span a taut angle structure.