This clause introduces the Object Constraint Language (OCL), a formal language used to describe expressions on UML
models. These expressions typically specify invariant conditions that must hold for the system being modeled or queries
over objects described in a model. Note that when the OCL expressions are evaluated, they do not have side effects (i.e.,
their evaluation cannot alter the state of the corresponding executing system).
OCL expressions can be used to specify operations / actions that, when executed, do alter the state of the system. UML
modelers can use OCL to specify application-specific constraints in their models. UML modelers can also use OCL to
specify queries on the UML model, which are completely programming language independent.
Note - This clause is informative only and not normative.
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浙江理工大学一区食堂三楼，每个碗里面都装了芯片，点完饭菜后把托盘往桌面上的结算区一放，自动感应出有几样菜、多少钱，读卡区自动扣除饭卡里的钱！整个结算过程只要两三秒昨天中午12点，浙江理工大学桂花园三楼教工餐厅，因为新生还没报到，其他年级同学也没到齐，吃饭的人没几个。点餐区和外面社会上的中式快餐厅差不多，先拿托盘再选菜，一个个菜盛在小碗里。结算区，立着两台80厘米高、1.5米长、70厘米宽的机器，像两个柜台。这两个柜台全名叫“智盘—自选餐厅快速结算系统”，简称“智盘”，台上面有一块显示屏。餐厅阿姨
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LM324通用四运放的原理与应用LM324通用四运放的原理与应用LM324通用四运放的原理与应用LM324通用四运放的原理与应用
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原始html+css+js的方式，没采用es6的import方式，提供样例代码，拉过来就能用，需要import的可以去GitHub上下es6的，或者从我另外一个资源里下
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20210413-国泰君安-全球流动性观察系列第8期：海外风险预期回升，国内信用周期放缓.pdf
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