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Compare XML Schema Java API

The following listing shows how to compare two XML Schema documents with Java and the Membrane SOA Model.

package sample.schema;

import java.util.List;
import com.predic8.schema.Schema;
import com.predic8.schema.SchemaParser;
import com.predic8.schema.diff.SchemaDiffGenerator;
import com.predic8.soamodel.Difference;

public class CompareSchema {

  public static void main(String[] args) {
  private static void compare(){
    SchemaParser parser = new SchemaParser();

    Schema schema1 = parser.parse("resources/diff/1/common.xsd");

    Schema schema2 = parser.parse("resources/diff/2/common.xsd");

    SchemaDiffGenerator diffGen = new SchemaDiffGenerator(schema1, schema2);
    List<Difference> lst = diffGen.compare();
    for (Difference diff : lst) {
      dumpDiff(diff, "");
  private static void dumpDiff(Difference diff, String level) {
    System.out.println(level + diff.getDescription());
    for (Difference localDiff : diff.getDiffs()){
      dumpDiff(localDiff, level + "  ");

Listing 1: CompareSchema.java

After executing you get the output shown in listing 2. It is a List of differences between the two Schema documents.

ComplexType PersonType has changed:
  Sequence has changed:
    Element id has changed:
      The type of element id has changed from xsd:string to tns:IdentifierType.