本文首先深入分析多无人机任务分配问题的特点，建立了扩展的混合整数线性规划(MILP)任务分配模型。
Firstly, the features of UAV task assignment are analyzed in depth, and then the extended mixed integer linear programming (MILP) model for task assignment is established.
此模型扩展定义了4种持久化dom节点类型，设计了一种存储混合型XML文档的方法，并依据文档的次序建立了数据聚集。
This model has defined 4 extra persistent DOM node types, designed a storing method of mixed structure XML documents and created clustered data based on XML document orders.
为了能够表示和处理关系数据库中这种混合类不完全信息，文中最后给出了一种简化的扩展关系模型。
In order to express and process mixed-type incomplete information in relational database, a - simplified expanded relational model is given.
然而，在混合整数线性规划的框架下，模型的扩展十分困难。
However, it is quite difficult for the expansion of model under the MILP framework.
然而，在混合整数线性规划的框架下，模型的扩展十分困难。
However, it is quite difficult for the expansion of model under the MILP framework.
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