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Hi, I’m currently looking at the DFDL (http://www.ogf.org/dfdl/). DFDL is for “Data Format Description Language” and aims to provide a standardized way of describing data formats relying
on XML schemas formalism. I was wondering if libxml2 would be able to parse DFDL schemas as it uses a subset of XML schemas. I know that the support of XML schemas in libxml2 is partial so below is the list of features used by DFDL mentioned in the specification
(http://www.ogf.org/documents/GFD.174.pdf, chapter 5.1). I’m not sure if that list is meaningful for you, however, I would like to know if there could be any issue regarding the support of those features
in libxml2? DFDL Schemas consist of: • Standard XSDL namespace management • Standard XSDL import and management for multiple file schemas • Local element declarations with dimensionality via xs:maxOccurs and xs:minOccurs. • Global element declarations • ComplexType definitions with empty or element-only content • DFDL appinfo annotations describing the data format • These simple types: string, float, double, decimal, integer, long, int, short, byte, nonNegativeInteger, unsignedLong, unsignedInt, unsignedShort, unsignedByte, boolean, date, time, dateTime, hexBinary • These facets: minLength, maxLength, minInclusive, maxInclusive, minExclusive, maxExclusive, totalDigits, fractionDigits, enumeration, pattern (for xs:string type only) • Fixed values • Default values • 'sequence' model groups (without xs:minOccurs and xs:maxOccurs) • 'choice' model groups (without xs:minOccurs and xs:maxOccurs) • Simple type derivations derived by restriction from the allowed built-in types • Reusable Groups: named model group definitions can only contain one model group • Element references with dimensionality via xs:maxOccurs and xs:minOccurs. • Group references without dimensionality • xs:nillable="true" only on elements of simple type. • Appinfo annotations for sources other than DFDL are permitted and ignored • Unions; the memberTypes must be derived from the same simple type. DFDL annotations are not permitted on union members. 3 • XML Entities Thank you in advance for your help! Best regards, Matthieu Hazon |