src/main/java/org/xmlet/xsdparser/core/XsdParserCore.java
public void addFileToParse(String schemaLocation) {
        if (!schemaLocations.contains(schemaLocation) && schemaLocation.endsWith(".xsd")){
            schemaLocations.add(schemaLocation);
        }
    }
public void addFileToParse(String schemaLocation) {
        if (!schemaLocations.contains(schemaLocation) && schemaLocation.endsWith(".xsd")){
            schemaLocations.add(schemaLocation);
        }
    }
Adds a new file to the parsing queue. This new file appears by having xsd:import or xsd:include tags in the
original file to parse.
@param schemaLocation A new file path of another XSD file to parse.