This closes #47, support for optional element (#81)

Author: djnalluri

genGo.go

@@ -218,11 +218,15 @@ func (gen *CodeGenerator) GoComplexType(v *ComplexType) {
 			if element.Plural {
 				plural = "[]"
 			}
+			var optional string
+			if element.Optional {
+				optional = `,omitempty`
+			}
 			fieldType := genGoFieldType(getBasefromSimpleType(trimNSPrefix(element.Type), gen.ProtoTree))
 			if fieldType == "time.Time" {
 				gen.ImportTime = true
 			}
-			content += fmt.Sprintf("\t%s\t%s%s\t`xml:\"%s\"`\n", genGoFieldName(element.Name, false), plural, fieldType, element.Name)
+			content += fmt.Sprintf("\t%s\t%s%s\t`xml:\"%s%s\"`\n", genGoFieldName(element.Name, false), plural, fieldType, element.Name, optional)
 		}
 		if len(v.Base) > 0 {
 			// If the type is a built-in type, generate a Value field as chardata.

test/go/base64.xsd.go

@@ -82,7 +82,7 @@ pub struct TopLevel {
 	#[serde(rename = "LastUpdated")]
 	pub last_updated: Option<u8>,
 	#[serde(rename = "nested")]
-	pub nested: MyType7,
+	pub nested: Option<MyType7>,
 	#[serde(rename = "myType1")]
 	pub my_type1: Vec<String>,
 	#[serde(rename = "myType2")]

test/rs/base64.xsd.rs

@@ -48,6 +48,15 @@ func (opt *Options) OnElement(ele xml.StartElement, protoTree []interface{}) (er
 				e.Plural = true
 			}
 		}
+		if attr.Name.Local == "minOccurs" {
+			var minOccurs int
+			if minOccurs, err = strconv.Atoi(attr.Value); err != nil {
+				return
+			}
+			if minOccurs == 0 {
+				e.Optional = true
+			}
+		}
 	}
 
 	alreadyPushedElement := false