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Action 344 - Lookahead function  #66

@mbeckerle

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@mbeckerle

This extension needs a write up as a proposed extension to DFDL.

Internal Daffodil design note:
https://cwiki.apache.org/confluence/display/DAFFODIL/Proposal%3A+DFDLX+lookAhead

This feature, as implemented today in Daffodil, is in heavy use. There are quite a few formats that need this.

This feature is for "fixed length" data formats - it makes no sense for use in more general data formats.

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DFDL 2.0For issues associated with DFDL v2.0 (next major revision)experimentalin useindicates implemented and feature being used

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