[DFDL-WG] How to specify type/subtype combos?
Steve Hanson
smh at uk.ibm.com
Thu Jun 20 12:03:03 EDT 2013
You could use an assert on the sequence that tested for the allowed
combinations? Such an assert is evaluated at the end of the sequence. If
you get that far then both the Type and Subtype must have passed their
individual asserts. Use fn:upper-case() to handle mixed case. Note that
you can't reuse the information in the facets in the assert's expression
though.
Strictly speaking, this sort of cross-field 'complex' validation is not
something DFDL was designed to do. The WG has considered this a post-parse
validation step, the sort of thing that folk use Schematron or similar
tools to do. Although asserts are designed as a parsing aid, they can be
used to do some limited amount of complex validation - and I think this is
an example where it would work ok.
Let us know how you get on.
Regards
Steve Hanson
Architect, IBM Data Format Description Language (DFDL)
Co-Chair, OGF DFDL Working Group
IBM SWG, Hursley, UK
smh at uk.ibm.com
tel:+44-1962-815848
From: "Garriss Jr., James P." <jgarriss at mitre.org>
To: "dfdl-wg at ogf.org" <dfdl-wg at ogf.org>,
Date: 20/06/2013 16:34
Subject: [DFDL-WG] How to specify type/subtype combos?
Sent by: dfdl-wg-bounces at ogf.org
Content types come in pairs. So while the type can be “text” and the
subtype can be “pdf”, the complete content type cannot be “text/pdf”. It
can, however, be “text/html” or “application/pdf”.
So in my DFDL it’s not sufficient to specify enumerated lists for types
and subtypes (as I have done below), I must also specify which types are
allowed to go with which subtypes.
How would I do that, given this complexType? TIA!
<xsd:complexType name="MimeTypeType">
<xsd:sequence dfdl:separator="/">
<xsd:element name="Type" dfdl:initiator="">
<xsd:annotation>
<xsd:appinfo source="http://www.ogf.org/dfdl/dfdl-1.0/
">
<dfdl:assert test="{ dfdl:checkConstraints(.) }"
message="The type must match one of the values on the enumerated list."/>
</xsd:appinfo>
</xsd:annotation>
<xsd:simpleType>
<xsd:restriction base="xsd:string">
<xsd:pattern
value=
"([a|A][p|P][p|P][l|L][i|I][c|C][a|A][t|T][i|I][o|O][n|N])|
([m|M][u|U][l|L][t|T][i|I][p|P][a|A][r|R][t|T])|
([m|M][e|E][s|S][s|S][a|A][g|G][e|E])|
([t|T][e|E][x|X][t|T])"
/>
</xsd:restriction>
</xsd:simpleType>
</xsd:element>
<xsd:element name="Subtype" dfdl:terminator="">
<xsd:annotation>
<xsd:appinfo source="http://www.ogf.org/dfdl/dfdl-1.0/
">
<dfdl:assert test="{ dfdl:checkConstraints(.) }"
message="The subtype must match one of the values on the enumerated list."
/>
</xsd:appinfo>
</xsd:annotation>
<xsd:simpleType>
<xsd:restriction base="xsd:string">
<xsd:pattern
value="([p|P][d|D][f|F])|
([a|A][l|L][t|T][e|E][r|R][n|N][a|A][t|T][i|I][v|V][e|E])|
([m|M][i|I][x|X][e|E][d|D])|
([r|R][f|F][c|C]822)|
([p|P][l|L][a|A][i|I][n|N])|
([h|H][t|T][m|M][l|L])"
/>
</xsd:restriction>
</xsd:simpleType>
</xsd:element>
</xsd:sequence>
</xsd:complexType>
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