missing error(nil) from XML(). This closes #1

Author: agrison

.gitignore

@@ -0,0 +1 @@
+.vscode/

tablib_test.go

@@ -3,9 +3,10 @@ package tablib_test
 import (
 	"bytes"
 	"encoding/base64"
+	"testing"
+
 	tablib "github.com/agrison/go-tablib"
 	. "gopkg.in/check.v1"
-	"testing"
 )
 
 func Test(t *testing.T) { TestingT(t) }
@@ -704,6 +705,27 @@ func (s *TablibSuite) TestLoadXML(c *C) {
 	c.Assert(r["lastName"], Equals, "Washington")
 }
 
+func (s *TablibSuite) TestXML(c *C) {
+	ds := presidentDataset()
+	xml, err := ds.XML()
+	c.Assert(err, Equals, nil)
+	c.Assert(xml, Equals, "<dataset>\n"+
+		"  <row>\n"+
+		"    <firstName>John</firstName>\n"+
+		"    <gpa>90</gpa>\n"+
+		"    <lastName>Adams</lastName>\n"+
+		"  </row>  <row>\n"+
+		"    <firstName>George</firstName>\n"+
+		"    <gpa>67</gpa>\n"+
+		"    <lastName>Washington</lastName>\n"+
+		"  </row>  <row>\n"+
+		"    <firstName>Thomas</firstName>\n"+
+		"    <gpa>50</gpa>\n"+
+		"    <lastName>Jefferson</lastName>\n"+
+		"  </row>\n"+
+		"  </dataset>")
+}
+
 // ---------- Benchmarking ----------
 
 func (s *TablibSuite) BenchmarkAppendRow(c *C) {

tablib_xml.go

@@ -6,35 +6,41 @@ import (
 )
 
 // XML returns a XML representation of the Dataset as string.
-func (d *Dataset) XML() string {
+func (d *Dataset) XML() (string, error) {
 	return d.XMLWithTagNamePrefixIndent("row", "  ", "  ")
 }
 
 // XML returns a XML representation of the Databook as string.
-func (d *Databook) XML() string {
+func (d *Databook) XML() (string, error) {
 	str := "<databook>\n"
 	for _, s := range d.sheets {
 		str += "  <sheet>\n    <title>" + s.title + "</title>\n    "
-		str += s.dataset.XMLWithTagNamePrefixIndent("row", "      ", "  ")
+        row, err := s.dataset.XMLWithTagNamePrefixIndent("row", "      ", "  ")
+        if err != nil {
+            return "", nil
+        }
+		str += row
 		str += "\n  </sheet>"
 	}
 	str += "\n</databook>"
-	return str
+	return str, nil
 }
 
 // XMLWithTagNamePrefixIndent returns a XML representation with custom tag, prefix and indent.
-func (d *Dataset) XMLWithTagNamePrefixIndent(tagName, prefix, indent string) string {
+func (d *Dataset) XMLWithTagNamePrefixIndent(tagName, prefix, indent string) (string, error) {
 	back := d.Dict()
 
 	var b bytes.Buffer
 	b.WriteString("<dataset>\n")
 	for _, r := range back {
 		m := mxj.Map(r.(map[string]interface{}))
-		m.XmlIndentWriter(&b, prefix, indent, tagName)
+		if err :=m.XmlIndentWriter(&b, prefix, indent, tagName); err != nil {
+            return "", err
+        }
 	}
 	b.WriteString("\n" + prefix + "</dataset>")
 
-	return b.String()
+	return b.String(), nil
 }
 
 // LoadXML loads a Dataset from an XML source.