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### 1.2 Objects

Each `page` contains some number of schematic elements, represented by the `object` type. There are several sub-types of `object`, including:

- graphical lines, circles, arcs, rectangles and paths;
- nets and net pins;
- buses and bus pins;
- pictures;
- text;
- and symbol instances, known as ’components’.

Each `object` can be part of at most a single `page` – they cannot be shared between pages. `object`s are automatically garbage collected.

Most of different `object` sub-types are quite straightforward to understand. The main exceptions are components, and the text `object`-based attribute mechanism, which are described in the following sections.