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Implementation Example:
string oclcnumber = "823520553";
string principleID = "[enter your principalID]";
string principlelDNS = "[enter your principalIDNS]";
string wskey = "[your oclc wskey]";
string secret = "[your secret key]";
string instSymbol = "[oclc provide institution code]";
string holdingsid = "[oclc provided code]"; //a four digit code from oclc; example MAIN
string schema = "LibraryOfCongress";
oclc_api.oclc_api_metadata obj_om = new oclc_api.oclc_api_metadata(wskey, secret, principleID, principlelDNS);
obj_om.WorldCat_Service_URI = oclc_api.oclc_api_metadata.HOLDINGS_DATA_URI;  //@"https://worldcat.org/ih/data";
bool results = obj_om.WorldCatDeleteHolding(schema, instSymbol, oclcnumber);
System.Windows.MessageBox.Show(obj_om.LastResponseCode);