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# `LiteralTagPacker` examples
Some [MsgField](https://github.com/credibledoc/credible-doc/blob/master/iso-8583-packer/src/main/java/com/credibledoc/iso8583packer/message/MsgField.java)
with [MsgValue](https://github.com/credibledoc/credible-doc/blob/master/iso-8583-packer/src/main/java/com/credibledoc/iso8583packer/message/MsgValue.java)
pairs contain `TAG` subfields, see the [field-types.md](../field-types.md) page with description of field types.
The following example shows how to define `TAG` in the `Literal` format
```Java
&&beginPlaceholder {
"className": "com.credibledoc.substitution.content.generator.code.SourceContentGenerator",
"description": "Example of Literal tag definition",
"parameters": {
"sourceRelativePath": "iso-8583-packer/src/test/java/com/credibledoc/iso8583packer/literal/LiteralTagPackerTest.java",
"beginString": " private FieldBuilder createField() {",
"endString": " }",
"indentation": ""
}
} &&endPlaceholder
```
The field structure
```XML
&&beginPlaceholder {
"className": "com.credibledoc.substitution.content.generator.code.SourceContentGenerator",
"description": "MsgField dump",
"parameters": {
"sourceRelativePath": "iso-8583-packer/log/iso-8583-packer.log",
"beginString": "LiteralTagPackerTest - MsgField structure dump: ",
"includeBeginString": "false",
"endString": "",
"indentation": ""
}
} &&endPlaceholder
```
The following example shows packing and unpacking of the field value
```Java
&&beginPlaceholder {
"className": "com.credibledoc.substitution.content.generator.code.SourceContentGenerator",
"description": "Example of Literal tag packing and unpacking",
"parameters": {
"sourceRelativePath": "iso-8583-packer/src/test/java/com/credibledoc/iso8583packer/literal/LiteralTagPackerTest.java",
"beginString": " String value = \"1234\";",
"endString": "assertEquals(value, unpackedValue);",
"indentation": ""
}
} &&endPlaceholder
```
The packed `FieldValue` with `TAG` looks like the next example
```XML
&&beginPlaceholder {
"className": "com.credibledoc.substitution.content.generator.code.SourceContentGenerator",
"description": "MsgValue dump",
"parameters": {
"sourceRelativePath": "iso-8583-packer/log/iso-8583-packer.log",
"beginString": "LiteralTagPackerTest - MsgValue structure dump: ",
"includeBeginString": "false",
"endString": "",
"indentation": ""
}
} &&endPlaceholder
```
Some examples of packed values
```
&&beginPlaceholder {
"className": "com.credibledoc.substitution.content.generator.code.SourceContentGenerator",
"description": "Some examples of packed values",
"parameters": {
"sourceRelativePath": "iso-8583-packer/log/iso-8583-packer.log",
"beginString": "Examples of Strings packed with LiteralTagPacker",
"includeBeginString": "true",
"endString": "Examples end.",
"includeEndString": "false",
"indentation": ""
}
} &&endPlaceholder
```
More examples see [complex-example.md](../complex-example.md).
