Fixed a low level bug with locating nodes.

locating nodes was looking through two levels to locate something. This is not the correct behavior, after making the change - lots of tests needed to be updated to be correct in what they put into as a the root node.

datamodel/high/base/xml_test.go

@@ -4,33 +4,33 @@
 package base
 
 import (
-    "fmt"
-    lowmodel "github.com/pb33f/libopenapi/datamodel/low"
-    lowbase "github.com/pb33f/libopenapi/datamodel/low/base"
-    "gopkg.in/yaml.v3"
+	"fmt"
+	lowmodel "github.com/pb33f/libopenapi/datamodel/low"
+	lowbase "github.com/pb33f/libopenapi/datamodel/low/base"
+	"gopkg.in/yaml.v3"
 )
 
 func ExampleNewXML() {
 
-    // create an example schema object
-    // this can be either JSON or YAML.
-    yml := `
+	// create an example schema object
+	// this can be either JSON or YAML.
+	yml := `
 namespace: https://pb33f.io/schema
 prefix: sample`
 
-    // unmarshal raw bytes
-    var node yaml.Node
-    _ = yaml.Unmarshal([]byte(yml), &node)
+	// unmarshal raw bytes
+	var node yaml.Node
+	_ = yaml.Unmarshal([]byte(yml), &node)
 
-    // build out the low-level model
-    var lowXML lowbase.XML
-    _ = lowmodel.BuildModel(&node, &lowXML)
-    _ = lowXML.Build(node.Content[0], nil)
+	// build out the low-level model
+	var lowXML lowbase.XML
+	_ = lowmodel.BuildModel(node.Content[0], &lowXML)
+	_ = lowXML.Build(node.Content[0], nil)
 
-    // build the high level tag
-    highXML := NewXML(&lowXML)
+	// build the high level tag
+	highXML := NewXML(&lowXML)
 
-    // print out the XML namespace
-    fmt.Print(highXML.Namespace)
-    // Output: https://pb33f.io/schema
+	// print out the XML namespace
+	fmt.Print(highXML.Namespace)
+	// Output: https://pb33f.io/schema
 }