The in_map construct is used to map external formats to internal formats during decoding. The general syntax for an in-map declaration is as follows:

in_map <map_name> : <in_map options> {
   <explicit map specifications>
   <automatic> : <automatic options> {
      <automatic mapping specifications>
   };
   <sub-external specifications>
};

The general in-map options are:

Option	Description
`external(<external_name>)`	Specifies the external format to map from. This is a mandatory parameter.
`internal(<internal_name>)`	The internal format name to map to. This is a mandatory parameter, unless `target_internal` is specified.
`target_internal(<target_internal_name>)`	The target internal format name created when automatically generating a map. This parameter is only valid for `automatic` mappings.
`discard_output`	Specifies that the `in_map` will produce no output when used in a decoder. This can be useful for uninteresting "filler records" that are not needed for processing.
`emit_field(field1, field2, ...)`	Specifies that a decoder using this `in_map` will not route out the top level UDR. Instead, the content (records or list of records) of the named fields are routed.

Specially named options can also be supplied in the in_map depending on the type of the external format. The type specific options are:

Option	Description
`ipdr_compact`	Only applicable for XML based formats (IPDR formats). Specifies that the IPDR "compact" encoding is to be used.
`PER_aligned`	Only applicable for ASN.1 based formats. Specifies that PER encoding (ALIGNED version) is to be used.
`PER_unaligned`	Only applicable for ASN.1 based formats. Specifies that PER encoding (UNALIGNED version) is to be used.

Option	Description
`<explicit map specifications>`	Describes how the external fields are mapped to the internal fields. These specifications are optional. i:<internal field> and e:<external field> [ using in_map <sub_map> ] ;
`<automatic>`	Specifies that all external fields not explicitly mapped in `<explicit_map_specifications>` will be implicitly mapped according to the external formats implicit type conversions. It is also possible to control the behavior of the automatic mapping through options or a specification block, see the section below, Automatic Maps, for details).
`<sub-external specifications>`	This is used to handle the special case where the mapped external is the parent of other externals that must be considered for decoding. This is currently only supported for XML schema based externals where it is used to support, for instance, IPDR decoding.
`ignore_unknown_tags`	This option can be used to ignore unknown tags when the external format is ASN.1 BER. Example - ignore_unknown_tags Adding the following for an in_map creates an in_map called inMapIgnoringUnknownTags that simply ignores any unknown tags in the BER encoding: in_map inMapIgnoringUnknownTags: external(Udr), target_internal(Udr), ignore_unknown_tags { automatic; }; Note! This functionality can also be achieved by using the ASN.1 extensibility syntax. For example, entering the following code results in tags of the type `TheType` to be ignored: TheType ::= SEQUENCE { boolField (1) BOOLEAN OPTIONAL, }

This chapter includes the following sections:

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