xsd2go.xsl

xsd2go.xsl is an XSLT stylesheet that converts XML Schema to Go type definitions. Not all XSD elements are supported, but the most popular are:

• global and local element definitions and declarations, local definitions are hoisted to the package level
• attribute
• simpleType, complexType and simpleContent, complexContent
• sequence and choice
• extension, restriction and enumeration
• annotation and documentation

Use

The stylesheet uses XSLT 1.0 plus a tokenize function from EXSLT as supported by xsltproc (libxml2)

xsltproc xsd2go.xsl some.xsd > some.go

The following parameters are supported (--stringparam in xsltproc):

• indent indent string, default 2 spaces
• break line break char, default 
 or CR (carriage return)
• debug write out schema types in comments, default 'no'
• buildtag //go:build tags for the generated file, default empty
• targetNamespace defaults to /xs:schema/@targetNamespace
• package Go package name, defaults to str:tokenize(str:tokenize($targetNamespace, '/')[last()],'.')[1]
• omitempty whether to set omitempty modifier on field tags for optional and repeating elements, default yes
• xmlns_xsd defaults to http://www.w3.org/2001/XMLSchema
• attributeForm qualified or unqualified, defaults to xs:schema/@attributeFormDefault
• qAttrType data type to use for qualified attributes, defaults to string which is non-qualified, see PrefixAttr
• qAttrImport import for the qualified attributes type package, e.g xmlext "github.com/indexdata/edge-slnp/utils". Note that this import is applied only when attributeForm is qualified
• dateTimeType data type to use for XSD dateTime, defaults to string
• timeType data type to use for XSD time, defaults to string
• dateType data type to use for XSD date, defaults to string
• decimalType data type to use for XSD decimal, defaults to float64
• typeImports comma-separated list of imports for additional type definitions used for date/time and decimal types
• json should json tags be generated as well, default no

You can also see rendered Go structs in the browser by prepending:

<?xml-stylesheet type="text/xsl" href="xsd2go.xsl"?>

to the XSD and opening the file in the browser, best by serving it with a local HTTP server like python3 -m http.server to avoid local security constraints. This works in Firefox but fails silently in Chrome, likely because of missing EXSLT support.

Use in a Go build

This repo includes a simple Go wrapper over xsltproc which you can run with:

go run github.com/indexdata/xsd2goxsl <in.xsd> <out.go> <param-name=param-value>,...

e.g

go run github.com/indexdata/xsd2goxsl xsd/ncip_v2_02.xsd ncip/schema.go "qAttrImport=utils \"github.com/indexdata/go-utils/utils\"" qAttrType=utils.PrefixAttr dateTimeType=utils.XSDDateTime

This allows using it in a Go project during the build with go generate. E.g by adding a Go xsd-gen.go file to the project with:

package ncip

//go:generate go  run github.com/indexdata/xsd2goxsl xsd/ncip_v2_02.xsd ncip/schema.go "qAttrImport=utils \"github.com/indexdata/go-utils/utils\"" qAttrType=utils.PrefixAttr dateTimeType=utils.XSDDateTime decimalType=utils.XSDDecimal

and running:

go generate

Additionally, you can add a disabled source file with an import for this project to force Go handling it as a dependency:

//go:build tools

package tools

//build-time toolchain dependencies
import (
	_ "github.com/indexdata/xsd2goxsl"
)

Test

There are example XSDs and corresponding generated Go models under ./xsd.