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Parsing xml for user defined attributes
I have a requirement to parse an xml and generate columns based on parameters specified by the user to the pig script.

For eg,  consider the following xml

My requirement is to parse the xml and generate the attributes depending on the field names specified by the user.
For eg, if the user specifies the field name as 'name|rno' , the parser should parse the xml and return a tuple containing name and rno.

I am using XML Loader to parse the xml up to student and then have written a java UDF to parse the student xml.
I tried to define a parameterized constructor in my java UDF class wherein I pass the columns/ attributes to be parsed.
I have then overridden the outputSchema(Schema input) method , in which I fetch the column names and add new field schema.

However this does not work the way expected. Is there any way of getting this done?
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