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@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@gmail.com> Cc: "Cranford, Jonathan W." <jcranford@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@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