The more difficult part of this feature is figuring out where in the code to set the auditing data. For this you have a few choices.

这个特性比较难的部分是，决定在代码中的什么地方设置审计信息。

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These had to do with issues such as data auditing and transition from older technologies, which were not in the original contract, a Google spokesman said.

FORBES: Magazine Article

On Monday, Dillon Beresford, an analyst for security auditing firm NSS Labs, took aim at Siemens in a message to a mailing list devoted to supervisory control and data acquisition (SCADA) software used in physical systems like power plants and factories.

FORBES: Siemens Accused Of Whitewashing Critical Security Bugs