# Fields

Any **field** can be defined as independent element inside the **\<fields>** child of the [\<schema>](https://alex-robenko.gitbook.io/commsdsl-specification/schema_def) or a [namespace](https://alex-robenko.gitbook.io/commsdsl-specification/namespaces).

```
<?xml version="1.0" encoding="UTF-8"?>
<schema ...>
    <fields>
        <int name="SomeField" type="uint8" />
        ...
    </fields>
</schema>
```

It can also be defined as a member of a message.

```
<?xml version="1.0" encoding="UTF-8"?>
<schema ...>
    <message name="SomeMessage" id="1">
        <int name="SomeField" type="uint8" />
        ...
    </message>
</schema>
```

Field that is defined as a child of **\<fields>** node of the [\<schema>](https://alex-robenko.gitbook.io/commsdsl-specification/schema_def) or [\<ns>](https://alex-robenko.gitbook.io/commsdsl-specification/namespaces) can be referenced by other fields to avoid duplication of the same definition.

```
<?xml version="1.0" encoding="UTF-8"?>
<schema ...>
    <ns name="ns1">
        <int name="SomeField" type="uint8" />
        <ref name="AliasToField" field="ns1.SomeField" />
    </ns>
    <message name="SomeMessage" id="1">
        <ref name="Mem1" field="ns1.SomeField"" />
        ...
    </message>
</schema>
```

The available fields are described in details in the sections to follow. They are:

* [\<enum>](https://alex-robenko.gitbook.io/commsdsl-specification/fields/enum) - Enumeration field.
* [\<int>](https://alex-robenko.gitbook.io/commsdsl-specification/fields/int) - Integral value field.
* [\<set>](https://alex-robenko.gitbook.io/commsdsl-specification/fields/set) - Bitset (bitmask) field.
* [\<bitfield>](https://alex-robenko.gitbook.io/commsdsl-specification/fields/bitfield) - Bitfield field.
* [\<bundle>](https://alex-robenko.gitbook.io/commsdsl-specification/fields/bundle) - Bundle field.
* [\<string>](https://alex-robenko.gitbook.io/commsdsl-specification/fields/string) - String field.
* [\<data>](https://alex-robenko.gitbook.io/commsdsl-specification/fields/data) - Raw data field.
* [\<list>](https://alex-robenko.gitbook.io/commsdsl-specification/fields/list) - List of other fields.
* [\<float>](https://alex-robenko.gitbook.io/commsdsl-specification/fields/float) - Floating point value field.
* [\<ref>](https://alex-robenko.gitbook.io/commsdsl-specification/fields/ref) - Reference to (alias of) other field.
* [\<optional>](https://alex-robenko.gitbook.io/commsdsl-specification/fields/optional)- Optional field.
* [\<variant>](https://alex-robenko.gitbook.io/commsdsl-specification/fields/variant)- Variant field.

All this fields have [common](https://alex-robenko.gitbook.io/commsdsl-specification/fields/common) as well as their own specific set of properties.


---

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