First implementation of an atom feed

category.go

@@ -0,0 +1,30 @@
+package atomfeed
+
+import (
+	"errors"
+	"fmt"
+)
+
+type Category struct {
+	*CommonAttributes
+	Content *Content `xml:"content"`
+	Term    string   `xml:"term,attr"`
+	Scheme  URI      `xml:"scheme,attr,omitempty"`
+	Label   string   `xml:"label,attr,omitempty"`
+}
+
+func (c *Category) Check() error {
+	if c.Term == "" {
+		return errors.New("term attribute of category empty")
+	}
+
+	if c.Content == nil {
+		return errors.New("no content element of category")
+	} else {
+		if err := (*c.Content).Check(); err != nil {
+			return fmt.Errorf("content element of category: %v", err)
+		}
+	}
+
+	return nil
+}