State	Short Description	Long Description
1	Loading	Preparing to read the XML file. Did not try yet.
2	Loaded	Reading and parsing the XML file. Object model still not available.
3	Interactive	Part of the XML file successfully parsed and read in. Object model partially available for read only.
4	Completed	Loading of the XML file has been completed, successfully or unsuccessfully.

When you read an XML file successfully, the readyState property goes through all four states: 1,2,3, and 4. When you are unsuccessful in reading an XML file, the readyState property may skip 3 on some operating systems. Obviously, it is very difficult to know exactly when the readyState property changes its value. For this very purpose the DOMDocument object provides the onreadystatechange event handler.

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