A doctype declaration is mandatory if the document is to be processed in a validating environment 如果文档要在验证环境中进行处理， doctype声明是必选项。
Only required when declaring an unparsed entity through the use of the non - xml data ndata keyword 只有使用非xml数据( ndata )关键字声明未分析实体时，才是必选项。
If an argument type is followed by a question mark , the argument is optional ; otherwise , the argument is required 如果参数类型后接问号，参数是可选项；否则，参数是必选项。
Required for each property , procedure , event , interface , class , or structure defined as a member of the interface 对于这些项目为必选项：定义为接口成员的每个属性、过程、事件、接口、类或结构。
When used , it indicates that the element rule that precedes it is required , and can occur more than once at this point in the xml document structure 使用加号时，指示加号之前的元素/规则是必选项，在xml文档结构的此位置可以出现多次。
The xml declaration is not required , however , if used it must be the first line in the document and no other content or white space can precede it Xml声明不是必选项，但是如果使用xml声明，必须在文档的第一行，前面不得包含任何其他内容或空白。
Xml documentation files are not required for intellisense to work for code within a project or within projects referenced by a project . unless you compile with 要让intellisense对项目中的代码或被一个项目引用的多个项目中的代码有效， xml文档文件不是必选项。
Please tick . two items at most per person . the player who would like to fight for the all - around champion should take part in 3 items ( color - on creative nail is required ) 参赛选手请在比赛项目后对应“ ”内画“ ” ,也可同时报名参加2项比赛。团体规模三人以上，计三人最高分，不影响单人参赛成绩。角逐全能冠军任选三项（彩妆创意甲为必选项） 。
Please tick . two items at most per person . the player who would like to fight for the all - around champion should take part in 3 items ( color - on creative nail is required ) 参赛选手请在比赛项目后对应“ ”内画“ ”每人最多可报名参加4项比赛。团体规模三人以上，计三人最高分，不影响单人参赛成绩。角逐全能冠军任选三项（彩妆创意甲为必选项） 。
