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OGF DFDL WG Call Agenda 2014-04-11 (Friday)
by Steve Hanson 10 Apr '14

10 Apr '14

Please find agenda for call on Redmine at http://redmine.ogf.org/dmsf_files/13233?download= This is a rescheduled call. Start time is 3pm UK / 10am Eastern. Regards Steve Hanson Architect, IBM Data Format Description Language (DFDL) Co-Chair, OGF DFDL Working Group IBM SWG, Hursley, UK smh(a)uk.ibm.com tel:+44-1962-815848

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Action 254: Updated words for zoned numbers
by Steve Hanson 10 Apr '14

10 Apr '14

Updated description for textZonedSignStyle to reflect that not all EBCDIC encodings use the same characters for the code points. Text in red is from public comment 116. ---------------------- Specifies the code points that are used to overpunch the sign nibble when the encoding is an ASCII-derived character set.encoding. The location of this sign nibble is indicated in the dfdl:textNumberPattern. This property is applicable when dfdl:textNumberRep is 'zoned' Used only when dfdl:encoding is an ASCII-derived character set encoding. The encoding must provide the character to single byte code point mapping used by the specified value of dfdl:textZonedSignStyle, as stated below. Valid values 'asciiStandard', 'asciiTranslatedEBCDIC', 'asciiCARealiaModified', and 'asciiTandemModified' Which characters are used to represent 'overpunched' (included) positive and negative signs, varies by encoding, Cobol compiler and system. The code points are fixed for EBCDIC systems but not for ASCII. In EBCDIC-based encodings, code points 0xC0 to 0xC9 or 0xF0 to 0xF9 represent a positive sign and digits 0 to 9 (typically characters '{ABCDEFGHI' or '0123456789'), and code points 0xD0 to 0xD9 or 0xB0 to 0xB9 represent a negative sign and digits 0 to 9 (typically characters '}JKLMNOPQR' or '^£¥·©§¶¼½¾ ' ). On parsing both ranges will be accepted. On unparsing the range 0xC0 to 0xC9 will be produced for positive signs and the range 0xD0 to 0xD9 will be produced for negative signs. asciiStandard: ASCII characters '0123456789' represent a positive sign and the corresponding digit. (Sign nibble for '+' is 0x3, which is the high nibble of these code points unmodified.) ASCII characters 'pqrstuvwxy' represent negative sign and digits 0 to 9. (Code points 0x70 to 0x79) asciiTranslatedEBCDIC: The overpunched character is the ASCII equivalent of the typical EBCDIC above. So the characters '{ABCDEFGHI' still represent a positive sign and digits 0 to 9. (These are code points 0x7B, 0x41 through 0x49). The characters '}JKLMNOPQR' still represent negative sign and digits 0 to 9. (These are code points 0x7D, 0x4A through 0x52). This case comes up if EBCDIC zoned decimal data is translated to ASCII as if it were textual data.) asciiCARealiaModified: In this style, the ASCII characters '0123456789' represent positive sign and digits 0 to 9 as in standard. However, ASCII characters from code points 0x20 to 0x29 are used for negative sign and the corresponding decimal digit. This doesn't translate well into printing characters. These characters include the space (' ') for zero, characters '!"#$%&' for 1 through 6, the single quote character "'" for 7, and the parenthesis '()' for 8 and 9. asciiTandemModified: In this style the ASCII characters '0123456789' represent positive sign and digits 0 to 9, but code points 0x80 to 0x89 are used to represent negative sign and a digit. There are no corresponding code points in the standard ASCII encoding since these values are all above 128 (decimal). This means the resultant bytes are not code points in standard ASCII, so the modeller must specify an encoding like ISO-8859-1 in order for such zoned decimals to parse without an encoding error. (Note that neither ISO-8859-1 encoding nor Unicode have assigned glyphs for these code points. They are considered control characters.) --------------------- Regards Steve Hanson Architect, IBM DFDL Co-Chair, OGF DFDL Working Group IBM SWG, Hursley, UK smh(a)uk.ibm.com tel:+44-1962-815848 Unless stated otherwise above: IBM United Kingdom Limited - Registered in England and Wales with number 741598. Registered office: PO Box 41, North Harbour, Portsmouth, Hampshire PO6 3AU

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Re: [DFDL-WG] newbie question
by Tim Kimber 28 Mar '14

28 Mar '14

I didn't see the requirement for a pattern facet in your problem description. Feel free to use a pattern facet if you require one. If you want to perform cross-field validation then you should probably use DFDL asserts ( not discriminators ) for that. The best place to put the asserts is on the parent element, addressing ./A and ./C. You could use the exceptionType attribute on the assert (if the DFDL processor supports it) to make it throw a recoverable error instead of a processing error. That would enable invalid data to be parsed, and you would still be notified of any ( and all ) violations of the validation rules. regards, Tim Kimber, IBM Integration Bus Development (Industry Packs) Hursley, UK Internet: kimbert(a)uk.ibm.com Tel. 01962-816742 Internal tel. 37246742 From: "mfcplus(a)yahoo.com" <mfcplus(a)yahoo.com> To: Tim Kimber/UK/IBM@IBMGB, Date: 28/03/2014 13:21 Subject: Re: [DFDL-WG] newbie question so if i am not to use a pattern, how do i validate against the alphanumeric part? also i have a conditional in the message type, should i use discriminator with xpath rxpression for that? elemA /elemB/elemC CRLF elemC/elemD/elemE CRLF elemF/elemG/elemH CRLF for the above strcuture, i have a requirement that elemC must not exist if elemA is not there, and must exist if elemA is there. sequenceC must not exist if sequenceA is not there, sequenceC must exist if sequenceA is there. just wondering how do i do that with dfdl discriminator. mant thanks again Sent from Yahoo Mail on Android. From: Tim Kimber <KIMBERT(a)uk.ibm.com>; To: mfcplus(a)yahoo.com <mfcplus(a)yahoo.com>; Cc: <dfdl-wg(a)ogf.org>; Subject: Re: [DFDL-WG] newbie question Sent: Fri, Mar 28, 2014 11:34:12 AM The key point here is that the data format is delimited, and there is a requirement to validate the parsed info set against some rules ( length constraints, in this case). I would - set terminator="/" - set lengthKind='delimited' - use xs:minLength and xs:maxLength facets to check the length ( or use a pattern facet if you must, but min/maxLength facets will use less CPU ) - switch on validation in the DFDL parser so that the length of the delimited value gets checked against the facets in the schema. Other possibilities exist ( e.g. DFDL assert to check the length ) but this is the most efficient. regards, Tim Kimber, IBM Integration Bus Development (Industry Packs) Hursley, UK Internet: kimbert(a)uk.ibm.com Tel. 01962-816742 Internal tel. 37246742 From: "mfcplus(a)yahoo.com" <mfcplus(a)yahoo.com> To: Tim Kimber/UK/IBM@IBMGB, Date: 28/03/2014 11:25 Subject: Re: [DFDL-WG] newbie question a field that is 3-5 chars long alphanumeric, basically a \w{3,5}, it should give out parsing error if it doesnt fit by the pattern, no initiator terminator is / Sent from Yahoo Mail on Android From: Tim Kimber <KIMBERT(a)uk.ibm.com>; To: <dfdl-wg(a)ogf.org>; Subject: Re: [DFDL-WG] newbie question Sent: Fri, Mar 28, 2014 10:19:47 AM It depends on the data format. Normally a variable length field is terminated by a delimiter, so a data pattern/regex is not required. Can you describe the format in a little more detail? regards, Tim Kimber, IBM Integration Bus Development (Industry Packs) Hursley, UK Internet: kimbert(a)uk.ibm.com Tel. 01962-816742 Internal tel. 37246742 From: Bing Lu <mfcplus(a)yahoo.com> To: "dfdl-wg(a)ogf.org" <dfdl-wg(a)ogf.org>, Date: 28/03/2014 03:35 Subject: [DFDL-WG] newbie question Sent by: dfdl-wg-bounces(a)ogf.org what's the best dfdl approache to describe a variable length alpha numeric field? should i use simpletype restriction pattern, or use dfdl:assert testPattern? thanks in advance-- dfdl-wg mailing list dfdl-wg(a)ogf.org https://www.ogf.org/mailman/listinfo/dfdl-wg Unless stated otherwise above: IBM United Kingdom Limited - Registered in England and Wales with number 741598. Registered office: PO Box 41, North Harbour, Portsmouth, Hampshire PO6 3AU Unless stated otherwise above: IBM United Kingdom Limited - Registered in England and Wales with number 741598. Registered office: PO Box 41, North Harbour, Portsmouth, Hampshire PO6 3AU Unless stated otherwise above: IBM United Kingdom Limited - Registered in England and Wales with number 741598. Registered office: PO Box 41, North Harbour, Portsmouth, Hampshire PO6 3AU

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Re: [DFDL-WG] newbie question
by Tim Kimber 28 Mar '14

28 Mar '14

The key point here is that the data format is delimited, and there is a requirement to validate the parsed info set against some rules ( length constraints, in this case). I would - set terminator="/" - set lengthKind='delimited' - use xs:minLength and xs:maxLength facets to check the length ( or use a pattern facet if you must, but min/maxLength facets will use less CPU ) - switch on validation in the DFDL parser so that the length of the delimited value gets checked against the facets in the schema. Other possibilities exist ( e.g. DFDL assert to check the length ) but this is the most efficient. regards, Tim Kimber, IBM Integration Bus Development (Industry Packs) Hursley, UK Internet: kimbert(a)uk.ibm.com Tel. 01962-816742 Internal tel. 37246742 From: "mfcplus(a)yahoo.com" <mfcplus(a)yahoo.com> To: Tim Kimber/UK/IBM@IBMGB, Date: 28/03/2014 11:25 Subject: Re: [DFDL-WG] newbie question a field that is 3-5 chars long alphanumeric, basically a \w{3,5}, it should give out parsing error if it doesnt fit by the pattern, no initiator terminator is / Sent from Yahoo Mail on Android From: Tim Kimber <KIMBERT(a)uk.ibm.com>; To: <dfdl-wg(a)ogf.org>; Subject: Re: [DFDL-WG] newbie question Sent: Fri, Mar 28, 2014 10:19:47 AM It depends on the data format. Normally a variable length field is terminated by a delimiter, so a data pattern/regex is not required. Can you describe the format in a little more detail? regards, Tim Kimber, IBM Integration Bus Development (Industry Packs) Hursley, UK Internet: kimbert(a)uk.ibm.com Tel. 01962-816742 Internal tel. 37246742 From: Bing Lu <mfcplus(a)yahoo.com> To: "dfdl-wg(a)ogf.org" <dfdl-wg(a)ogf.org>, Date: 28/03/2014 03:35 Subject: [DFDL-WG] newbie question Sent by: dfdl-wg-bounces(a)ogf.org what's the best dfdl approache to describe a variable length alpha numeric field? should i use simpletype restriction pattern, or use dfdl:assert testPattern? thanks in advance-- dfdl-wg mailing list dfdl-wg(a)ogf.org https://www.ogf.org/mailman/listinfo/dfdl-wg Unless stated otherwise above: IBM United Kingdom Limited - Registered in England and Wales with number 741598. Registered office: PO Box 41, North Harbour, Portsmouth, Hampshire PO6 3AU Unless stated otherwise above: IBM United Kingdom Limited - Registered in England and Wales with number 741598. Registered office: PO Box 41, North Harbour, Portsmouth, Hampshire PO6 3AU

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newbie question
by Bing Lu 28 Mar '14

28 Mar '14

what's the best dfdl approache to describe a variable length alpha numeric field? should i use simpletype restriction pattern, or use dfdl:assert testPattern? thanks in advance

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alignment questions
by Mike Beckerle 26 Mar '14

26 Mar '14

Are leadingSkip always byte aligned, or are they N * 8 bits added on. Similarly trailingSkip E.g., <element name="x" type="xs:int" dfdl:lengthKind="explicit" dfdl:length="1" dfdl:lengthUnits="bits" dfdl:trailingSkip="10" dfdl:alignmentUnits="bytes" dfdl:alignment="1"/> So, after this element am I at bit 81 or bit 88? In other words, does the trailingSkip region get aligned per size of alignment unit, or does alignment really only happen at the beginning of an element. Mike Beckerle | OGF DFDL Workgroup Co-Chair | Tresys Technology | www.tresys.com Please note: Contributions to the DFDL Workgroup's email discussions are subject to the OGF Intellectual Property Policy<http://www.ogf.org/About/abt_policies.php>

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OGF DFDL WG Call Minutes 2014-03-25
by Steve Hanson 26 Mar '14

26 Mar '14

Please find minutes from the above call at http://redmine.ogf.org/dmsf_files/13220?download= Next call is Fri 11th April @ 3pm UK. Regards Steve Hanson Architect, IBM DFDL, Co-Chair, OGF DFDL Working Group IBM SWG, Hursley, UK smh(a)uk.ibm.com tel:+44-1962-815848

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Rescheduled: DFDL Working Group Call (11 Apr 15:00 GDT in DE3S09)
by Steve Hanson 26 Mar '14

26 Mar '14

Rescheduled: DFDL Working Group Call 11/04/2014 - (Repeats) Location: DE3S09 Steve Hanson has rescheduled this meeting. You have not yet responded. Repeats This entry repeats Required: jcranford(a)mitre.org, mbeckerle(a)tresys.com, Suman Kalia/Toronto/IBM@IBMCA, Tim Kimber/UK/IBM@IBMGB Optional: Alex Wood1/UK/IBM@IBMGB, Andrew Edwards/UK/IBM@IBMGB, dfdl-wg(a)ogf.org, jonathan.w.cranford(a)gmail.com, Mark Frost/UK/IBM, mbeckerle.dfdl(a)gmail.com, Stephanie Fetzer/Charlotte/IBM@IBMUS OGF DFDL WG weekly call dial-in details. Passcode for Participants: 5381214 Canada Toll-Free 888-426-6840 China Toll-Free 10-800-711-1071 CHINA NETCOM GROUP USERS China Toll-Free 10-800-110-0996 CHINA TELECOM SOUTH USERS France Toll-Free 0800-94-0558 Germany Toll-Free 0800-000-1018 India Toll-Free 000-800-100-1176 Ireland Toll-Free 1-800-943-427 Israel Toll-Free 1-809-417-783 United Kingdom Caller Paid 0-20-30596451 United Kingdom Toll-Free 0800-368-0638 USA Caller Paid 215-861-6239 USA Toll-Free 888-426-6840 Other international numbers available - e-mail smh(a)uk.ibm.com. OGF DFDL Home: http://www.ogf.org/dfdl Redmine DFDL: http://redmine.ogf.org/projects/dfdl-wg

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Cancelled: DFDL Working Group Call
by Steve Hanson 26 Mar '14

26 Mar '14

Cancelled: DFDL Working Group Call 01/04/2014 - (Repeats) Location: DE3S09 Steve Hanson has cancelled this meeting. Your calendar will be updated to reflect this change. Repeats This entry repeats Required: jcranford(a)mitre.org, mbeckerle(a)tresys.com, Suman Kalia/Toronto/IBM@IBMCA, Tim Kimber/UK/IBM@IBMGB Optional: Alex Wood1/UK/IBM@IBMGB, Andrew Edwards/UK/IBM@IBMGB, dfdl-wg(a)ogf.org, jonathan.w.cranford(a)gmail.com, Mark Frost/UK/IBM, mbeckerle.dfdl(a)gmail.com, Stephanie Fetzer/Charlotte/IBM@IBMUS

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lengthUnits bits not allowed for complex type - Unnecessary restriction on length units?
by Mike Beckerle 26 Mar '14

26 Mar '14

In section 12.3.7.3 we have this sentence: "The dfdl:lengthUnits may be 'bytes' or 'characters' and it is a schema definition error otherwise. " Does anyone recall why we have this? I have data formats which are bit oriented and there are complex types which would naturally not be a multiple of 8 bytes long, e.g., 1 bit field, 3 bit field, 10 bit field, 6 bit field = 20 bits. I can't think of any reason for this restriction other than to explain how fillByte is used to fill in unused bits. But I think we can say that any unused bits are filled in with bits from the fillByte, and we don't have to be specific about which bits from the fillByte. Mike Beckerle | OGF DFDL Workgroup Co-Chair | Tresys Technology | www.tresys.com Please note: Contributions to the DFDL Workgroup's email discussions are subject to the OGF Intellectual Property Policy<http://www.ogf.org/About/abt_policies.php>

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