[DFDL-WG] examples of decimal validation using pattern facet

[Mike Beckerle]

Roger costello of Mitre provides this example of using pattern facet.

Basically, it expresses several different possible formats, all of which
are some combination of digits and a optional decimal point.  In terms of
cobol-style patterns it is one of these formats:

99
99.9
99.99
99.999
99.9999

I am not sure a textNumberPattern can handle the optionality of the decimal
point. I know we can deal with the varying number of fraction digits, and
the fixed number of integer digits, but conditional decimal point I am
unsure about.







---------- Forwarded message ----------
From: Costello, Roger L. <costello at mitre.org>
Date: Fri, May 17, 2013 at 4:00 PM
Subject: RE: examples of decimal validation using pattern facet
To: Mike Beckerle <mbeckerle.dfdl at gmail.com>
Cc: "Cranford, Jonathan W." <jcranford at mitre.org>


 Hello Mike,****

** **

**Ø  **Can you send an example of the lat/lon validation ****

**Ø  **you mentioned on yesterday's Daffodil call?****

** **

Here ya go:****


            <xsd:simpleType name="foo">
                        <xsd:restriction base="xsd:decimal">****

                                    <xsd:minInclusive value="00"/>
                                    <xsd:maxInclusive value="59.9999"/>
                                    <xsd:pattern value=
"[0-9]{2}|[0-9]{2}\.[0-9]{1}|[0-9]{2}\.[0-9]{2}|[0-9]{2}\.[0-9]{3}|[0-9]{2}\.[0-9]{4}"
/>
                        </xsd:restriction>
            </xsd:simpleType>****

** **

/Roger****

** **

*From:* Mike Beckerle [mailto:mbeckerle.dfdl at gmail.com]
*Sent:* Thursday, May 16, 2013 8:15 AM
*To:* Costello, Roger L.
*Subject:* examples of decimal validation using pattern facet****

** **

Roger,

Can you send an example of the lat/lon validation you mentioned on
yesterday's Daffodil call?

The other members of the workgroup are wondering what can't be done via
totalDigits/fractionDigits, etc.

The rationale for why pattern facet is not supported on numbers in DFDL is
that we already have a much more powerful mechanism for parsing and
unparsing numbers called textNumberPattern. The pattern facet only allows
pass/fail using a regex, and is considered redundant (and problematic) for
numbers as a result.

...mike

-- 
Mike Beckerle | OGF DFDL Workgroup Co-Chair | Tresys Technology |
www.tresys.com****



-- 
Mike Beckerle | OGF DFDL Workgroup Co-Chair | Tresys Technology |
www.tresys.com
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