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RNGOM is an open-source Java library for parsing RELAX NG grammars.

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package org.kohsuke.rngom.binary;

import org.kohsuke.rngom.binary.visitor.PatternFunction;
import org.kohsuke.rngom.binary.visitor.PatternVisitor;

public class InterleavePattern extends BinaryPattern {
  InterleavePattern(Pattern p1, Pattern p2) {
    super(p1.isNullable() && p2.isNullable(),
	  combineHashCode(INTERLEAVE_HASH_CODE, p1.hashCode(), p2.hashCode()),
	  p1,
	  p2);
  }
  Pattern expand(SchemaPatternBuilder b) {
    Pattern ep1 = p1.expand(b);
    Pattern ep2 = p2.expand(b);
    if (ep1 != p1 || ep2 != p2)
      return b.makeInterleave(ep1, ep2);
    else
      return this;
  }
  void checkRestrictions(int context, DuplicateAttributeDetector dad, Alphabet alpha)
    throws RestrictionViolationException {
    switch (context) {
    case START_CONTEXT:
      throw new RestrictionViolationException("start_contains_interleave");
    case DATA_EXCEPT_CONTEXT:
      throw new RestrictionViolationException("data_except_contains_interleave");
    case LIST_CONTEXT:
      throw new RestrictionViolationException("list_contains_interleave");
    }
    if (context == ELEMENT_REPEAT_CONTEXT)
      context = ELEMENT_REPEAT_INTERLEAVE_CONTEXT;
    Alphabet a1;
    if (alpha != null && alpha.isEmpty())
      a1 = alpha;
    else
      a1 = new Alphabet();
    p1.checkRestrictions(context, dad, a1);
    if (a1.isEmpty())
      p2.checkRestrictions(context, dad, a1);
    else {
      Alphabet a2 = new Alphabet();
      p2.checkRestrictions(context, dad, a2);
      a1.checkOverlap(a2);
      if (alpha != null) {
	if (alpha != a1)
	  alpha.addAlphabet(a1);
	alpha.addAlphabet(a2);
      }
    }
    if (context != LIST_CONTEXT
	&& !contentTypeGroupable(p1.getContentType(), p2.getContentType()))
      throw new RestrictionViolationException("interleave_string");
    if (p1.getContentType() == MIXED_CONTENT_TYPE
	&& p2.getContentType() == MIXED_CONTENT_TYPE)
      throw new RestrictionViolationException("interleave_text_overlap");
  }

  public void accept(PatternVisitor visitor) {
    visitor.visitInterleave(p1, p2);
  }
  public Object apply(PatternFunction f) {
    return f.caseInterleave(this);
  }
}