Re: Proposal: Add support for lookahead in DFDL expressions

2019-05-31 Thread Sloane, Brandon
. From: Beckerle, Mike Sent: Friday, May 31, 2019 6:41:56 PM To: dev@daffodil.apache.org Subject: Re: Proposal: Add support for lookahead in DFDL expressions I read the page: Please use namespace daf:lookAhead, not dfdl. The type of choiceDispatchKey is string. Should the function

Re: Proposal: Add support for lookahead in DFDL expressions

2019-05-31 Thread Beckerle, Mike
is better than implementation-dependent. We should specify a limit we're willing to live with. ...mikeb From: Sloane, Brandon Sent: Friday, May 31, 2019 4:44 PM To: dev@daffodil.apache.org Subject: Re: Proposal: Add support for lookahead in DFDL expression

Re: Proposal: Add support for lookahead in DFDL expressions

2019-05-31 Thread Sloane, Brandon
rt putting together the actual implementation. From: Sloane, Brandon Sent: Friday, May 31, 2019 4:15:52 PM To: dev@daffodil.apache.org Subject: Re: Proposal: Add support for lookahead in DFDL expressions The offset proposal would be sufficient, but seems like overkill f

Re: Proposal: Add support for lookahead in DFDL expressions

2019-05-31 Thread Sloane, Brandon
fodil. From: Beckerle, Mike Sent: Thursday, May 30, 2019 1:25:00 PM To: dev@daffodil.apache.org Subject: Re: Proposal: Add support for lookahead in DFDL expressions I really like your idea of doing this with a lookAhead function instead of some specialty variant

Re: Proposal: Add support for lookahead in DFDL expressions

2019-05-30 Thread Beckerle, Mike
ageId=74687382 <https://cwiki.apache.org/confluence/pages/viewpage.action?pageId=74687382> From: Sloane, Brandon Sent: Thursday, May 30, 2019 2:27:31 PM To: dev@daffodil.apache.org Subject: Re: Proposal: Add support for lookahead in DFDL expressions My initia

Re: Proposal: Add support for lookahead in DFDL expressions

2019-05-30 Thread Sloane, Brandon
aints. From: Beckerle, Mike Sent: Wednesday, May 29, 2019 6:39:27 PM To: dev@daffodil.apache.org Subject: Re: Proposal: Add support for lookahead in DFDL expressions Yup. This is a real situation. I think this happens in fixed length data for very mundane reasons explained in the att

Re: Proposal: Add support for lookahead in DFDL expressions

2019-05-29 Thread Beckerle, Mike
__ From: Sloane, Brandon Sent: Wednesday, May 29, 2019 1:00:04 PM To: dev@daffodil.apache.org Subject: Proposal: Add support for lookahead in DFDL expressions In developing schema for link16, I have encountered a situation that I do not believe Daffodil currently has a good solutions for. It is

Proposal: Add support for lookahead in DFDL expressions

2019-05-29 Thread Sloane, Brandon
In developing schema for link16, I have encountered a situation that I do not believe Daffodil currently has a good solutions for. It is a tagged union, where the tag comes after the union. In theory, the schema would look like: Obviously, this schema doe not work because it re