> For the complete documentation index, see [llms.txt](https://docs.openbrim.org/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.openbrim.org/developers/paramml-developer-guide/what-are-object-and-parameter.md).

# What are Object and Parameter?

In ParamML, each object is defined by its own set of parameters. Objects are defined using "O" statements, while parameters are defined using "P" statements. Each object and parameter has a start and end statement.

For example, for an object named "group," the starting expression would be and the closing expression would be .

Similarly, for a parameter named "length," the starting expression would be

and the closing expression would be

.

Everything between the beginning and end statements is considered to be part of the parameter or object to which it belongs. For an object to have meaning, it must be defined with parameters that are compatible with the type of the object. Similarly, a parameter's meaning can depend on the hierarchical position in which it is defined. If an expression does not contain other expressions, abbreviations may be used.

**Example**

**Object:**

```
<O N="group" T="Group">
....
....
</O>
```

**Parameter:**

```
<P N="length" V="10"/>
```


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