The Application Level Events (ALE) Specification, Version 1.0 - GS1

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611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 return a string corresponding to a version of this specification to which the implementation fully complies, and SHOULD return the string corresponding to the latest version to which it complies. To indicate compliance with this Version 1.0 of the ALE specification, the implementation SHALL return the string 1.0. The method getVendorVersion returns a string that identifies what vendor extensions this implementation provides. The possible values of this string and their meanings are vendor-defined, except that the empty string SHALL indicate that the implementation implements only standard functionality with no vendor extensions. When an implementation chooses to return a non-empty string, the value returned SHALL be a URI where the vendor is the owning authority. For example, this may be an HTTP URL whose authority portion is a domain name owned by the vendor, a URN having a URN namespace identifier issued to the vendor by IANA, an OID URN whose initial path is a Private Enterprise Number assigned to the vendor, etc. 8.1.1 Error Conditions Methods of the ALE API signal error conditions to the client by means of exceptions. The following exceptions are defined. All the exception types in the following table are extensions of a common ALEException base type, which contains one string element giving the reason for the exception. Exception Name SecurityException DuplicateNameException ECSpecValidationException InvalidURIException NoSuchNameException NoSuchSubscriberException Meaning The operation was not permitted due to an access control violation or other security concern. The specific circumstances that may cause this exception are implementation-specific, and outside the scope of this specification. The specified ECSpec name already exists. The specified ECSpec is invalid; e.g., it specifies both a start trigger and a repeat period. The complete list of rules for generating this exception are specified in Section 8.2.11. The URI specified for a subscriber cannot be parsed, does not name a scheme recognized by the implementation, or violates rules imposed by a particular scheme. The specified ECSpec name does not exist. The specified subscriber does not exist. Copyright © 2005, 2004 EPCglobal Inc, All Rights Reserved. Page 20 of 71
629 630 Exception Name DuplicateSubscriptionException ImplementationException Meaning The specified ECSpec name and subscriber URI is identical to a previous subscription that was created and not yet unsubscribed. A generic exception thrown by the implementation for reasons that are implementation-specific. This exception contains one additional element: a severity member whose values are either ERROR or SEVERE. ERROR indicates that the ALE implementation is left in the same state it had before the operation was attempted. SEVERE indicates that the ALE implementation is left in an indeterminate state. The exceptions that may be thrown by each ALE method are indicated in the table below: ALE Method define undefine getECSpec getECSpecNames subscribe unsubscribe Exceptions DuplicateNameException ECSpecValidationException SecurityException ImplementationException NoSuchNameException SecurityException ImplementationException NoSuchNameException SecurityException ImplementationException SecurityException ImplementationException NoSuchNameException InvalidURIException DuplicateSubscriptionException SecurityException ImplementationException NoSuchNameException NoSuchSubscriberException InvalidURIException SecurityException ImplementationException Copyright © 2005, 2004 EPCglobal Inc, All Rights Reserved. Page 21 of 71
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The Application Level Events (ALE) Specification, Version 1.0 - GS1

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