Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_name_63 (prince_xml VARCHAR, gecko VARCHAR, webkit VARCHAR)

### Question ###
What is the Prince XML value for the engine that has a Gecko value of 'no' and webkit value of 'nightly build'?

### Accurate SQL ###

SELECT prince_xml FROM table_name_63 WHERE gecko = "no" AND webkit = "nightly build"