Your class is a method collection.

Your class is a method collection. Static should only be used to implement the factory method pattern. This is not OOP.

This class was written to parse data to xml format, that was used in ebay API.

For example you create an input with name
"Item.AttributeArray.Attribute.Value.ValueLiteral", and it will be parsed to

<AttributeArray> AttributeArrayType
<Attribute attributeLabel="string"> AttributeType
<Value> ValType
<ValueLiteral> string </ValueLiteral>
</Value>
</Attribute>
</AttributeArray>

You're right, this is a method collection, which helped me a lot when working with ebay api, as the xml was generated automatically and I thougth it can be usefull to anyone else.

Collections of Methods which does not operate on the class instance are an abuse of classes ( factory methods are a exception for that ).

Your implementation works against OOP.

Thanks for Your comment. It'll help me to improve my skills in programming. I'll look into factory pattern for deeply understanding what I'm doing wrong.
Again, Thanks a lot.