Some repositories have immutable item classes that are set based on the item type, while others will allow a repository administrator or end user to define the classes that can be set on an item.

某些存储库具有不可改变的项目类，对其的设定是基于项目类型的；而其他的存储库则允许存储库管理员或终端用户对类进行定义，对其的设定是基于项目的。

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Double-clicking on the work item will open the work item, and you can modify the fields in the editor (Figure 20).

双击这个工作条目，他将会被打开，您可以修改这个编辑器中区域（图 20）。

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Searches on a single, identified item type perform better than searches across multiple item types.

对单一的可识别条目类型进行搜索的性能要好于跨多种条目类型的搜索。

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Then the last item, the fifth item, which bears especially on what's going on here -- the last item on our congressional "To-Do" list is something that will help a lot of you in particular.

WHITEHOUSE: President Obama Speaks on the Economy

Spending on Medicaid, the health-care safety net for the poor (and the third-largest item on many state budgets), jumped by 14% this year, thanks to costly new technology and the increasing demands of an ageing population.

ECONOMIST: State budgets

It also pulls detailed line-item information on bills.

FORBES: Pageonce Raises $15 Million Towards Mobile Wallet