new KmlAttribute(node, name)
    This class represents abstraction for KmlAttribute. It is possible to test its existence, retrieve value and set
value.
    Parameters:
| Name | Type | Description | 
|---|---|---|
| node | Node | Node on which the attribute exists | 
| name | String | Name of the attribute | 
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Methods
exists() → {boolean}
    It returns true if there exists attribute with given name.
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Returns:
- Type
- boolean
save(value)
    Value which should be set to the attribute.
    Parameters:
| Name | Type | Description | 
|---|---|---|
| value | String | 
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value() → {String|null}
    It returns value of the attribute. If the attribute doesn't exists it returns null.
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Returns:
- Type
- String | null