SaxParser.setProperty without a XSD file reference!

Question

Hi!
I currently make modifications to existing code that find errors in XML documents. The author is using the SAX (Simple API for XML) parser. In the code, following is written:
public void process(String xmlString, String msgType) throws Exception
String schemaLocation;
schemaLocation=Constants.XSD+msgType+".xsd";
parser.setProperty("http://apache.org/xml/properties/schema/external- schemaLocation", schemaLocation);
parser.parse(new InputSource(new StringReader(xmlString)));
if (this.errors != null)
throw new ValidationException(this.errors,"Schema violation(s) occured.");
} // public void process(String, String)
With the setProperty method, the SAXParser sets a relation between the string and the object schemaLocation, which is another string. I a guess that this information is used to access the file, as the value of this variable is
schemaLocation = "http://<IP Address>/ezoll/V01 file:///D:\\workspace\\ecs\\WebContent\\ezollat\\schemas
" + <msgType that defines the file name> + ".XSD"
QUESTION:
My problem is that the XSD file that contains the rules for the XML file is a special kind of file that should be read in only once so that access time is reduced. How is it possible to modify this such that instead of accessing over setProperty a file, some other Object that is in the memory cache should be used?
If you do not have a direct answer to the problem, which documentation would you advise to read? I have currently access to http://xerces.apache.org/xerces2-j/javadocs/xerces2/org/apache/xerces/parsers/SAXParser.html.
I know that reading all the file in the memory is somehow "violating" the idea of SAX; it's more DOM-like. But that is the requirement from my customer.
Thank you all for your support!

Answer 1

Thank you for the hint! I have found plenty of information online about the EntityResolver interface and classes that implement it from different vendors. I think that it will solve my problem.