# add-value

<add-value> is used to specify values added to the attribute specified in the enclosing <modify-attr>.

A driver should gracefully ignore an <add-value> for a value that already exists and continue to process the remainder of the enclosing <modify>.

Example

See <modify>

## 1. Allowed Content

> value
>   The attribute value.

## 2. No Attributes

## 3. Content Rule

> ( value + )

## 4. Parent Elements

> modify-attr
>   Modify attribute.

Top Elements || All Elements || Tree