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Multiple segments - A segments key with multiple child objects, each defining one segment. Multiple structures - A structures key with multiple child objects, each defining one structure. If you are only working with one type of record, you only need to have a segment definition for that record type in your FFD.
The example above simply defines a list of elements within a single segment. It has no composites to group them into. Note that simplified forms are only for convenience. You can use the segments key even if you only have a single child segment definition. If you are working with multiple types of records in the same transformation, you need to use a structure definition that controls how these different records are combined.
In most cases, you need to define a way to distinguish between the different types of records. You do this by identifying tagValue fields as part of the record definitions. The parser will check the content of the fields of each record to identify the record type, then see how it fits into the defined structure. Note that this example is not complete. It needs to define each of the referenced segments at the end.
See Referenced versus Inlined Definitions to understand how these segments are being referenced in this example. If you have multiple structures or segment definitions in an FFD, when you apply your schema to an metadata description on a Transform component, you need to specify which one you want to use.
The example defines two different structures, the BatchReq structure and the BatchRsp structure. Each of these structures uses a particular sequence of segments and groups of segments. The group Batch is repeated in both structures. See Referenced versus Inlined Definitions to understand how these segments are referenced in this example.
Element definitions are the basic building blocks of application data, consisting of basic key-value pairs for standard characteristics. Flat file schemas generally use inline element definitions, where each element is defined at the point it is used within a segment or composite structure, but you can also define elements separately and reference them as needed. Here are several element definitions defined for use by reference:. The supplied id value is used as the idRef value when referencing one of these definitions as part of a segment or composite.
Note that if you are defining elements inline within a segment definition as opposed to defining them at the end of the document and referencing them , the id field is not required. Element definitions might have the following attributes, classified by Form as applying to inline definitions, referenced definitions as in the above example , or references to definitions:.
Value for this element used to identify a segment see the Full Schema Example. Unzoned date value with year, month, and day components which might not all be shown in text form. Decimal number value, which might or might not include an explicit decimal point in text form. Unzoned time value with hour, minute, second, and millisecond components which might not all be shown in text form. Value types support a range of format options that affect the text form of the values.
These are the main options, along with the types to which they apply:. Implicit number of decimal digits used for fixed-point values with no decimal in text form. For numeric values, the java. DecimalFormat pattern for parsing and writing. DateTimeFormatter pattern. Composites serve to reference a list of elements that are typically presented together.
For example, firstName and lastName can be bundled together into a single composite because they are likely to be referred to as a group.
Grouping elements into a composite also allows the list to be repeated. Composite definitions are very similar to segment definitions, composed of some key-value pairs for standard characteristics along with lists of values.
Composites might include both references to elements or other nested composites and inlined definitions. This is a example of a composite definition:.
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