Fields

Any field can be defined as independent element inside the <fields> child of the <schema> or a namespace.

<?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> or <ns> 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> - Enumeration field.
• <int> - Integral value field.
• <set> - Bitset (bitmask) field.
• <bitfield> - Bitfield field.
• <bundle> - Bundle field.
• <string> - String field.
• <data> - Raw data field.
• <list> - List of other fields.
• <float> - Floating point value field.
• <ref> - Reference to (alias of) other field.
• <optional>- Optional field.
• <variant>- Variant field.

All this fields have common as well as their own specific set of properties.