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","type":"text","marks":[{"type":"annotation","attrs":{"annotationType":"inlineComment","id":"f210f83d-efcc-467b-aaec-e15b71a1695b"}}]}]},{"type":"heading","attrs":{"level":2},"content":[{"text":"Schema Header ","type":"text"}]},{"type":"paragraph","content":[{"text":"The following is the layout of the SBE Schema header:","type":"text"}]},{"type":"paragraph","content":[{"text":"","type":"text"}]},{"type":"heading","attrs":{"level":2},"content":[{"text":"Schema Format","type":"text","marks":[{"type":"textColor","attrs":{"color":"#000000"}}]}]},{"type":"paragraph","content":[{"text":"The schema file is constructed of several sections including the following:","type":"text"}]},{"type":"paragraph","content":[{"text":"Primitive Type Encodings","type":"text","marks":[{"type":"strong"}]},{"text":" - Valid encoding specifications for each of the integer primitive types.","type":"text"}]},{"type":"paragraph","content":[{"text":"Simple Encodings ","type":"text","marks":[{"type":"strong"}]},{"text":"- Definition of specific values.","type":"text"}]},{"type":"paragraph","content":[{"text":"Composite Encodings","type":"text","marks":[{"type":"strong"}]},{"text":" - Specifies the range of valid values for a decimal field.","type":"text"}]},{"type":"paragraph","content":[{"text":"Enumerations","type":"text","marks":[{"type":"strong"}]},{"text":" - Conveys a single choice of mutually exclusive valid values. 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When a template is extended as an appended extension, customers can choose to continue using the prior template version or process the new data with the new schema version.","type":"text"}]},{"type":"paragraph","content":[{"text":"Customers who support template extension should verify any SBE schema update in New Release prior to a Production schema launch to ensure compatibility. ","type":"text"}]},{"type":"paragraph","content":[{"text":"For the ","type":"text"},{"text":"body","type":"text","marks":[{"type":"strong"}]},{"text":" and ","type":"text"},{"text":"repeating groups","type":"text","marks":[{"type":"strong"}]},{"text":" of SBE messages, appended template extension provides the following benefits:","type":"text"}]},{"type":"bulletList","content":[{"type":"listItem","content":[{"type":"paragraph","content":[{"text":"Templates are backward compatible","type":"text"}]}]},{"type":"listItem","content":[{"type":"paragraph","content":[{"text":"Template ID changes are less frequent","type":"text"}]}]},{"type":"listItem","content":[{"type":"paragraph","content":[{"text":"Expedited development time","type":"text"}]}]}]},{"type":"paragraph","content":[{"text":"In the event of an appended template extension, the following conditions will apply:","type":"text"}]},{"type":"bulletList","content":[{"type":"listItem","content":[{"type":"paragraph","content":[{"text":"Tags added to the ","type":"text"},{"text":"body","type":"text","marks":[{"type":"strong"}]},{"text":" of the message will be added to the end of the body, before the repeating groups. ","type":"text"},{"text":"In this scenario, the TemplateID will not change, but the schema version will change.","type":"text","marks":[{"type":"strong"}]}]}]},{"type":"listItem","content":[{"type":"paragraph","content":[{"text":"The BlockLength field in the Binary Header or Group will increase in value to include the length of the new tag.","type":"text"}]}]},{"type":"listItem","content":[{"type":"paragraph","content":[{"text":"Data fields can also be appended at the end of the repeating groups without updating the TemplateID, although the contents of the template and the schema version number will change. Each repeating group will include:","type":"text"}]}]},{"type":"listItem","content":[{"type":"paragraph"},{"type":"bulletList","content":[{"type":"listItem","content":[{"type":"paragraph","content":[{"text":"the new length of each entry in the repeating group","type":"text"}]}]},{"type":"listItem","content":[{"type":"paragraph","content":[{"text":"the number of entries in the repeating group","type":"text"}]}]}]}]}]},{"type":"heading","attrs":{"level":2},"content":[{"text":"Example: Template Before Appended Extension","type":"text"}]},{"type":"paragraph","content":[{"text":"For the example below, the schema version is 1.","type":"text"}]},{"type":"paragraph","content":[{"text":"","type":"text"}]},{"type":"paragraph","content":[{"text":"","type":"text"}]},{"type":"paragraph","content":[{"text":"","type":"text"}]},{"type":"paragraph","content":[{"text":"","type":"text"}]},{"type":"paragraph","content":[{"text":"","type":"text"}]},{"type":"paragraph","content":[{"text":"","type":"text"}]},{"type":"paragraph","content":[{"text":"","type":"text"}]},{"type":"paragraph","content":[{"text":"","type":"text"}]},{"type":"heading","attrs":{"level":2},"content":[{"text":"Example: Template After Appended Extension","type":"text"}]},{"type":"paragraph","content":[{"text":"In the example below “ExampleField3” has been appended to the template 99 header. 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","type":"text"}]},{"type":"paragraph","content":[{"text":"","type":"text"}]},{"type":"paragraph","content":[{"text":"","type":"text"}]},{"type":"paragraph","content":[{"text":"","type":"text"}]},{"type":"paragraph","content":[{"text":"","type":"text"}]},{"type":"paragraph","content":[{"text":"","type":"text"}]},{"type":"paragraph","content":[{"text":"","type":"text"}]},{"type":"paragraph","content":[{"text":"","type":"text"}]},{"type":"paragraph","content":[{"text":"","type":"text"}]},{"type":"paragraph","content":[{"text":"","type":"text"}]},{"type":"paragraph"},{"type":"paragraph","content":[{"text":"For a non-appended template extension, the template is ","type":"text"},{"text":"not","type":"text","marks":[{"type":"strong"}]},{"text":" backward-compatible and the new template must be implemented. Examples of a non-appended extension include:","type":"text"}]},{"type":"bulletList","content":[{"type":"listItem","content":[{"type":"paragraph","content":[{"text":"fields inserted or removed from the middle of a block (message root or repeating group entry)","type":"text"}]}]},{"type":"listItem","content":[{"type":"paragraph","content":[{"text":"encoding changes to existing fields, i.e. different data type or different size integer","type":"text"}]}]},{"type":"listItem","content":[{"type":"paragraph","content":[{"text":"repeating group removed or inserted in the middle of a message","type":"text"}]}]}]},{"type":"paragraph","content":[{"text":"For both appended and non-appended message changes, customers will be notified of the schema file version change to indicate new information in the schema file.","type":"text"}]},{"type":"paragraph"}],"version":1}

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