Comments (3)
In SBE, field ID is only in metadata, not on the wire. The specification states:
Unique field identifier (FIX tag)
The scope of uniqueness is not specified, however, so the Real Logic and Euronext schemas do not contradict the spec.
From a FIX perspective, the SBE ID was intended to correlate to a stable identifier in the FIX application layer. See the online specification here: https://www.fixtrading.org/online-specification/
from fix-simple-binary-encoding.
@donmendelson you're right, in the table about field attributes there's no uniqueness requirements, however in Schema validation section there is a statement:
Duplicate ID or name of field or group.
Attributes id and name must uniquely identify a type within a message schema. This applies to fields and groups.
To me it sounds like ID must be unique within a message.
Thanks for the answer, I will close the issue since you answered my question. If you think that documentation should be fixed, feel free to reopen it.
from fix-simple-binary-encoding.
@donmendelson just found in this table:
Name and id must uniquely identify a field type within a message schema.
Under this statement your previous answer doesn't look good.
I also have related question: how unique should message member name be? Documentation says the same "must uniquely identify a field within a message schema", however Real Logic generator allows fields with the same name on different message levels (btw it does the same for IDs, i.e. same IDs are not allowed on the same level but are OK on different levels).
from fix-simple-binary-encoding.
Related Issues (20)
- Version 2 XML schema proposal HOT 1
- Invalid character in the v2-0-RC3\resources\xsd\sbe-2.0rc3.xsd HOT 1
- Possibly redundant "description" attrubute in the "semanticAttributes" attributeGroup HOT 5
- Decimal number representation for monetary amounts
- Version 2 RC schema does not allow semanticType on encoding types
- Clarify offset and length related types HOT 5
- How extension mechanism is supposed to work when dimension type is unknown? HOT 7
- Improve variadic-length field specification HOT 1
- Why is nullValue not allowed for required field? HOT 4
- Questions about common field attributes HOT 2
- Why `symbolicName_t` is limited to 64 chars? HOT 3
- Can enum/set be optional? HOT 2
- Question: Forward compatibility between encoder code and schema version HOT 1
- Can `<field>` override presence of its type? HOT 2
- Schema extension mechanism violation
- SBE 2.0 features in 1.0 spec HOT 1
- Should `ref` use custom offset of the referred type?
- Better version constraints
- Ownership
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from fix-simple-binary-encoding.