rewrote README with better information

README

@@ -8,27 +8,11 @@
  Nodes now simply become collections and don't require you to read them in the
  order in which the xml.Parser finds them.
 
- xmlx.Document implements both these interfaces:
- 
-	type ILoader interface {
-		LoadFile(string) os.Error;
-		LoadString(string) os.Error;
-		LoadStream(*io.Reader) os.Error;
-	}
-
-	type ISaver interface {
-		SaveFile(string) os.Error;
-		SaveString(string) (string, os.Error);
-		SaveStream(*io.Writer) os.Error;
-	}
-
- This allows you to load/save xml data to and from pretty much any source.
-
  The Document currently implements 2 simple search functions which allow you to
  look for specific nodes.
  
-   Document.SelectNode(namespace, name string) *Node;
+   *document.SelectNode(namespace, name string) *Node;
-   Document.SelectNodes(namespace, name string) []*Node;
+   *document.SelectNodes(namespace, name string) []*Node;
  
  SelectNode() returns the first, single node it finds matching the given name
  and namespace. SelectNodes() returns a slice containing all the matching nodes.
@@ -36,3 +20,48 @@
  Note that these search functions can be invoked on individual nodes as well.
  This allows you to search only a subset of the entire document.
 
+ Each node exposes also a number of functions which allow easy access to a node
+ value or an attribute value. They come in various forms to allow transparent
+ conversion to types like int, int64, float, float32, float64, etc:
+
+   *node.GetValue(ns, name string) string;
+   *node.GetValuei(ns, name string) int;
+   *node.GetValuei64(ns, name string) int64;
+   *node.GetValuef(ns, name string) float;
+   *node.GetValuef32(ns, name string) float32;
+   *node.GetValuef64(ns, name string) float64;
+
+ Note that the GetValue() functions actually consider child nodes for matching 
+ names as well as the current node. In effect they first perform a 
+ node.SelectNode() and then return the value of the resulting node converted to
+ the appripriate type. This allows you to do this:
+
+    Consider this piece of xml:
+      <car>
+        <color>red</color>
+        <brand>BMW</brand>
+      </car>
+
+    Now this code:
+      node := doc.SelectNode("", "car");
+      brand := node.GetValue("", "brand");
+
+    Eventhough 'brand' is not the name of @node, we still get the right value
+    back (BMW), because GetValue searches through the child nodes when looking
+    for the value if the current node does not match the given namespace and
+    name.
+
+ For attributes, we only go through the attributes of the current node this
+ function is invoked on:
+
+   *node.GetAttr(ns, name string) string;
+   *node.GetAttri(ns, name string) int;
+   *node.GetAttri64(ns, name string) int64;
+   *node.GetAttrf(ns, name string) float;
+   *node.GetAttrf32(ns, name string) float32;
+   *node.GetAttrf64(ns, name string) float64;
+
+ All of these functions return either "" or 0 when the specified node or
+ attribute could not be found. No errors are generated.
+ 
+