sampler 

The animation element may contain any number of sampler elements.

Element Information

Model

input+
Children: input

Attributes

QName Type Fixed Default Use Inheritable Annotation
id xs:ID optional 
The id attribute is a text string containing the unique identifier of this element. This value 
must be unique within the instance document. Optional attribute.
post_behavior sampler_behavior_enum optional 
Indicates what the sampled value should be after the last key.
pre_behavior sampler_behavior_enum optional 
Indicates what the sampled value should be before the first key.

Source 

<xs:element name="sampler" type="sampler_type" maxOccurs="unbounded">
  <xs:annotation>
    <xs:documentation>The animation element may contain any number of sampler elements.</xs:documentation>
  </xs:annotation>
</xs:element>

Sample