The official PDF is this:
http://www.ogf.org/documents/GFD.207.pdf
Last I looked it is 244 pages, so print double sided!
I find the HTML version quite easy to use online with searching, etc.
It is here:
http://daffodil.apache.org/docs/dfdl/
From: Costello,
I want to print the specification. Is there a PDF or Word version?
/Roger
So the restriction on ES only as the nilValue for nillable complex types is to
avoid this problem.
If you allowed other kinds of nil indications then one needs the DFDL
properties to characterize and isolate the representation of those indicators.
For example, if you allow the nilValue="nil"
Hello DFDL community,
I learned that DFDL supports in-band nil values. Recall what an in-band nil is:
In-band nil: a symbol inserted into the region indicates nil. A part of the
region's value space is reserved for indicating nil.
I learned that, if the region is to hold an atomic value, then t
Hi -
I think Mike wrote that his speculation on the number of file formats is a
distraction and I agree.
I would, in fact dispute his claim and say that are likely to be millions of
file formats. Especially this is true since some of these file formats predate
electronic computers by over 100
Fantastic example!
Thank you Steve!
/Roger
-Original Message-
From: Steve Lawrence
Sent: Wednesday, July 10, 2019 8:37 AM
To: users@daffodil.apache.org
Subject: Re: Examples of file formats that use in-band nil? Examples of file
formats that use out-of-band nil?
Here's a nice real wo
Here's a nice real world example of how having an appropriate
representation of nil is important:
http://newsfeed.time.com/2012/02/18/mans-vanity-license-plate-attracts-2-in-erroneous-tickets/
A short summary: DC police use "NO TAGS" as the license plate value when
ticketing vehicles that do
I did a quick search of the schemas on the github DFDL schemas site.
NITF has nillable elements.
EDIFACT has nillable elements
In EDIFACT case, empty strings become nilled elements. That's in-band for
string.
NITF has nillable dates, and nillable strings. Nillable strings are empty
strings
My speculations are not worth documenting like this, and are a distraction from
the point of the slide.
Files are but one form of packaging for data. So you need to point out, though
perhaps not on the first slide, that data comes in different packages:
messages/data-grams, byte-streams, etc.
Hello DFDL community,
What is the difference between a file format and a data format?
Is DFDL intended for processing file formats or data formats? Or both?
/Roger
Hello DFDL community,
There are two ways file formats denote that a region has a nil value:
* In-band nil: a symbol inserted into the region indicates nil. A part of
the region's value space is reserved for indicating nil.
* Out-of-band nil: a symbol, separate from the region, indicates
Hello DFDL community,
I am trying to create a simple 1-slide intro to DFDL. Below is my attempt at
this. Any suggestions on ways to improve it? /Roger
[cid:image001.png@01D536ED.94AECB50]
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