这些文档的物理结构—兄弟元素的次序、数据是存储在属性中还是在PC DATA元素中、是否使用实体—往往是不重要的。

Their physical structure — the order of sibling elements, whether data is stored in attributes or PCDATA-only elements, whether entities are used — is often unimportant.

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在这些布局里，栅格常被用来保证结构平衡、层级和次序。

In these layouts, grids are often used to guarantee a structural balance, hierarchy and order.

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接下来的语言例如Pascal and c，它们提供了更高次序的结构例如“if - then - else”语句。

Next came languages like Pascal and c, which provided higher order constructs such as "if-then-else" statements.

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