b0298358_h_API___OCLC_Developer_Network__Description
[Parameter] recordSchema [Required?] optional [Possible Values] info%3Asrw%2Fschema%2F1%2Fmarcxml info%3Asrw%2Fschema%2F1%2Fdc default is MARC XML info%3Asrw%2Fschema%2F1%2Fmarcxml [Description] 
determines the result format
Bibliographic Resource - WorldCat Search API | OCLC Developer Network