Instanciate common attributes everywhere so one can simply use the extend method

category.go

@@ -15,7 +15,10 @@ type Category struct {
 
 // NewCategory creates a new Category. It returns a *Category.
 func NewCategory(term string) *Category {
-	return &Category{Term: term}
+	return &Category{
+		CommonAttributes: newCommonAttributes(),
+		Term:             term,
+	}
 }
 
 // SetLabel sets the Label attribute of the Category.

commonAttributes.go

@@ -13,7 +13,7 @@ type CommonAttributes struct {
 
 // NewCommonAttributes creates a new set of CommonAttributes. It returns a
 // *CommonAttributes.
-func NewCommonAttributes() *CommonAttributes {
+func newCommonAttributes() *CommonAttributes {
 	return new(CommonAttributes)
 }
 

date.go

@@ -18,7 +18,10 @@ func DateTime(t time.Time) string {
 
 // NewDate creates a new Date. It returns a *Date.
 func NewDate(t time.Time) *Date {
-	return &Date{DateTime: DateTime(t)}
+	return &Date{
+		CommonAttributes: newCommonAttributes(),
+		DateTime:         DateTime(t),
+	}
 }
 
 // Check checks the Date for incompatibilities with RFC4287. It returns an

entry.go

@@ -59,6 +59,7 @@ func (e *Entry) checkAuthors(authorInFeed bool) error {
 // NewEntry creates a new Entry. It returns a *Entry.
 func NewEntry(title string) *Entry {
 	return &Entry{
+		CommonAttributes: newCommonAttributes(),
 		ID:               NewID(NewURN()),
 		Title:            NewText("text", title),
 		Updated:          NewDate(time.Now()),

feed.go

@@ -28,6 +28,7 @@ type Feed struct {
 // NewFeed creates a new Feed. It returns a *Feed.
 func NewFeed(title string) *Feed {
 	return &Feed{
+		CommonAttributes: newCommonAttributes(),
 		ID:               NewID(NewURN()),
 		Title:            NewText("text", title),
 		Updated:          NewDate(time.Now()),

generator.go

@@ -16,7 +16,10 @@ type Generator struct {
 
 // NewGenerator creates a new Generator. It returns a *Generator.
 func NewGenerator(text string) *Generator {
-	return &Generator{Text: html.UnescapeString(text)}
+	return &Generator{
+		CommonAttributes: newCommonAttributes(),
+		Text:             html.UnescapeString(text),
+	}
 }
 
 // Check checks the Generator for incompatibilities with RFC4287. It returns an

icon.go

@@ -14,7 +14,10 @@ type Icon struct {
 
 // NewIcon creates a new Icon. It returns a *Icon.
 func NewIcon(uri string) *Icon {
-	return &Icon{URI: uri}
+	return &Icon{
+		CommonAttributes: newCommonAttributes(),
+		URI:              uri,
+	}
 }
 
 // Check checks the Icon for incompatibilities with RFC4287. It returns an

id.go

@@ -14,7 +14,10 @@ type ID struct {
 
 // NewID creates a new ID. It returns a *ID.
 func NewID(uri string) *ID {
-	return &ID{URI: uri}
+	return &ID{
+		CommonAttributes: newCommonAttributes(),
+		URI:              uri,
+	}
 }
 
 // Check checks the ID for incompatibilities with RFC4287. It returns an error.

inlineOtherContent.go

@@ -17,7 +17,12 @@ type InlineOtherContent struct {
 // *InlineOtherContent and an error.
 func newInlineOtherContent(mediaType string, content any) *InlineOtherContent {
 	mediaType, _, _ = mime.ParseMediaType(mediaType)
-	return &InlineOtherContent{Type: mediaType, AnyElement: content}
+
+	return &InlineOtherContent{
+		CommonAttributes: newCommonAttributes(),
+		Type:             mediaType,
+		AnyElement:       content,
+	}
 }
 
 // isContent checks whether the InlineOtherContent is a Content. It returns a

inlineTextContent.go

@@ -15,7 +15,11 @@ type InlineTextContent struct {
 // newInlineTextContent creates a new InlineTextContent. It returns a
 // *InlineTextContent.
 func newInlineTextContent(mediaType, text string) *InlineTextContent {
-	return &InlineTextContent{Type: mediaType, Text: text}
+	return &InlineTextContent{
+		CommonAttributes: newCommonAttributes(),
+		Type:             mediaType,
+		Text:             text,
+	}
 }
 
 // isContent checks whether the InlineTextContent is a Content. It returns a

inlineXHTMLContent.go

@@ -15,7 +15,11 @@ type InlineXHTMLContent struct {
 // newInlineXHTMLContent creates a new InlineXHTMLContent. It returns a
 // *InlineXHTMLContent.
 func newInlineXHTMLContent(mediaType string, div *XHTMLDiv) *InlineXHTMLContent {
-	return &InlineXHTMLContent{Type: mediaType, XHTMLDiv: div}
+	return &InlineXHTMLContent{
+		CommonAttributes: newCommonAttributes(),
+		Type:             mediaType,
+		XHTMLDiv:         div,
+	}
 }
 
 // isContent checks whether the InlineXHTMLContent is a Content. It returns a

link.go

@@ -19,7 +19,10 @@ type Link struct {
 
 // NewLink creates a new Link. It returns a *Link.
 func NewLink(href string) *Link {
-	return &Link{Href: href}
+	return &Link{
+		CommonAttributes: newCommonAttributes(),
+		Href:             href,
+	}
 }
 
 // Check checks the Link for incompatibilities with RFC4287. It returns an

logo.go

@@ -13,7 +13,10 @@ type Logo struct {
 
 // NewLogo creates a new Logo. It returns a *Logo.
 func NewLogo(uri string) *Logo {
-	return &Logo{URI: uri}
+	return &Logo{
+		CommonAttributes: newCommonAttributes(),
+		URI:              uri,
+	}
 }
 
 // Check checks the Logo for incompatibilities with RFC4287. It returns an

outOfLineContent.go

@@ -17,7 +17,12 @@ type OutOfLineContent struct {
 // *OutOfLineContent.
 func newOutOfLineContent(mediaType, src string) *OutOfLineContent {
 	mediaType, _, _ = mime.ParseMediaType(mediaType)
-	return &OutOfLineContent{Type: mediaType, SRC: src}
+
+	return &OutOfLineContent{
+		CommonAttributes: newCommonAttributes(),
+		Type:             mediaType,
+		SRC:              src,
+	}
 }
 
 // isContent checks whether the OutOfLineContent is a Content. It returns a

person.go

@@ -15,7 +15,10 @@ type Person struct {
 
 // NewPerson creates a new Person. It returns a *Person.
 func NewPerson(name string) *Person {
-	return &Person{Name: name}
+	return &Person{
+		CommonAttributes: newCommonAttributes(),
+		Name:             name,
+	}
 }
 
 // AddExtension adds the Extension to the Person.

plainText.go

@@ -15,7 +15,11 @@ func (p *PlainText) isText() bool { return true }
 
 // newPlainText creates a new PlainText. It returns a *PlainText.
 func newPlainText(textType, content string) *PlainText {
-	return &PlainText{Type: textType, Text: content}
+	return &PlainText{
+		CommonAttributes: newCommonAttributes(),
+		Type:             textType,
+		Text:             content,
+	}
 }
 
 // Check checks the PlainText for incompatibilities with RFC4287. It returns an

source.go

@@ -25,7 +25,7 @@ type Source struct {
 
 // NewSource creates a new Source. It returns a *Source.
 func NewSource() *Source {
-	return new(Source)
+	return &Source{CommonAttributes: newCommonAttributes()}
 }
 
 // Check checks the Source for incompatibilities with RFC4287. It returns an

xhtmlText.go

@@ -16,6 +16,7 @@ func (x *XHTMLText) isText() bool { return true }
 // newPlainText creates a new PlainText. It returns a *PlainText.
 func newXHTMLText(textType, content string) *XHTMLText {
 	return &XHTMLText{
+		CommonAttributes: newCommonAttributes(),
 		Type:             textType,
 		XHTMLDiv:         NewXHTMLDiv(content),
 	}