src/main/java/org/apache/xml/security/keys/keyresolver/implementations/RetrievalMethodResolver.java [94:112]:
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            Element e = obtainReferenceElement(resource, secureValidation);

            // Check to make sure that the reference is not to another RetrievalMethod
            // which points to this element
            if (XMLUtils.elementIsInSignatureSpace(e, Constants._TAG_RETRIEVALMETHOD)) {
                if (secureValidation) {
                    if (LOG.isLoggable(Level.DEBUG)) {
                        String error = "Error: It is forbidden to have one RetrievalMethod "
                                + "point to another with secure validation";
                        LOG.log(Level.DEBUG, error);
                    }
                    return null;
                }
                RetrievalMethod rm2 = new RetrievalMethod(e, baseURI);
                XMLSignatureInput resource2 = resolveInput(rm2, baseURI, secureValidation);
                Element e2 = obtainReferenceElement(resource2, secureValidation);
                if (e2 == element) {
                    LOG.log(Level.DEBUG, "Error: Can't have RetrievalMethods pointing to each other");
                    return null;
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src/main/java/org/apache/xml/security/keys/keyresolver/implementations/RetrievalMethodResolver.java [139:157]:
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            Element e = obtainReferenceElement(resource, secureValidation);

            // Check to make sure that the reference is not to another RetrievalMethod
            // which points to this element
            if (XMLUtils.elementIsInSignatureSpace(e, Constants._TAG_RETRIEVALMETHOD)) {
                if (secureValidation) {
                    if (LOG.isLoggable(Level.DEBUG)) {
                        String error = "Error: It is forbidden to have one RetrievalMethod "
                            + "point to another with secure validation";
                        LOG.log(Level.DEBUG, error);
                    }
                    return null;
                }
                RetrievalMethod rm2 = new RetrievalMethod(e, baseURI);
                XMLSignatureInput resource2 = resolveInput(rm2, baseURI, secureValidation);
                Element e2 = obtainReferenceElement(resource2, secureValidation);
                if (e2 == element) {
                    LOG.log(Level.DEBUG, "Error: Can't have RetrievalMethods pointing to each other");
                    return null;
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