ZOOM offers an interface to a subset of the Z39.50 extended services as well as a few privately defined ones:
Z39.50 Item Order (ILL). See Section 6.1, “Item Order”.
Record Update. This allows a client to insert, modify or delete records. See Section 6.2, “Record Update”.
Database Create. This a non-standard feature. Allows a client to create a database. See Section 6.3, “Database Create”.
Database Drop. This a non-standard feature. Allows a client to delete/drop a database. See Section 6.4, “Database Drop”.
Commit operation. This a non-standard feature. Allows a client to commit operations. See Section 6.5, “Commit Operation”.
    To create an extended service operation a ZOOM_package
    must be created. The operation is a five step operation. The
    package is created, package is configured by means of options,
    the package is send, result is inspected (by means of options),
    the package is destroyed.
   
    ZOOM_package ZOOM_connection_package(ZOOM_connection c,
                                         ZOOM_options options);
    const char *ZOOM_package_option_get(ZOOM_package p,
                                        const char *key);
    void ZOOM_package_option_set(ZOOM_package p, const char *key,
                                 const char *val);
    void ZOOM_package_send(ZOOM_package p, const char *type);
    void ZOOM_package_destroy(ZOOM_package p);
   
    The ZOOM_connection_package creates a
    package for the connection given using the options specified.
   
    Functions ZOOM_package_option_get and
    ZOOM_package_option_set gets and sets
    options.
   
    ZOOM_package_send sends
    the package the via connection specified in 
    ZOOM_connection_package.
    The type specifies the actual extended service
    package type to be sent.
   
Table 3.5. Extended Service Common Options
| Option | Description | Default | 
|---|---|---|
| package-name | Extended Service Request package name. Must be specified as part of a request | none | 
| user-id | User ID of Extended Service Package. Is a request option | none | 
| function | Function of package - one of create,delete,modify. Is
	a request option. | create | 
| waitAction | Wait action for package. Possible values: wait,waitIfPossible,dontWaitordontReturnPackage. | waitIfPossible | 
| targetReference | Target Reference. This is part of the response as returned by the server. Read it after a successful operation. | none | 
     For Item Order, type must be set to itemorder in
     ZOOM_package_send.
    
Table 3.6. Item Order Options
| Option | Description | Default | 
|---|---|---|
| contact-name | ILL contact name | none | 
| contact-phone | ILL contact phone | none | 
| contact-email | ILL contact email | none | 
| itemorder-item | Position for item (record) requested. An integer | 1 | 
     For Record Update, type must be set to update in
     ZOOM_package_send.
    
Table 3.7. Record Update Options
| Option | Description | Default | 
|---|---|---|
| action | The update action. One of specialUpdate,recordInsert,recordReplace,recordDelete,elementUpdate. | specialUpdate (recordInsert for updateVersion=1 which does not support specialUpdate) | 
| recordIdOpaque | Opaque Record ID | none | 
| recordIdNumber | Record ID number | none | 
| record | The record itself | none | 
| recordOpaque | Specifies an opaque record which is
	  encoded as an ASN.1 ANY type with the OID as tiven by option syntax(see below).
	  OptionrecordOpaqueis an alternative
	  to record - andrecordoption (above) is
	  ignored if recordOpaque is set. This option is only available in 
	  YAZ 3.0.35 and later and is meant to facilitate Updates with
	  servers from OCLC. | none | 
| syntax | The record syntax (transfer syntax). Is a string that is a known record syntax. | no syntax | 
| databaseName | Database from connection object | Default | 
| correlationInfo.note | Correlation Info Note (string) | none | 
| correlationInfo.id | Correlation Info ID (integer) | none | 
| elementSetName | Element Set for Record | none | 
| updateVersion | Record Update version which holds one of the values 1, 2 or 3. Each version has a distinct OID: 1.2.840.10003.9.5 (first version) , 1.2.840.10003.9.5.1 (second version) and 1.2.840.10003.9.5.1.1 (third and newest version). | 3 | 
     For Database Create, type must be set to create in
     ZOOM_package_send.
    
Table 3.8. Database Create Options
| Option | Description | Default | 
|---|---|---|
| databaseName | Database from connection object | Default |