private Issuer buildIssuer(final String selfEntityID) {
        val issuer = (Issuer) XMLObjectSupport.buildXMLObject(Issuer.DEFAULT_ELEMENT_NAME);
        issuer.setValue(selfEntityID);
        return issuer;
    }
Build the SAML protocol message Issuer element.

@param selfEntityID the entity ID of the protocol message issuer (this entity)
@return the Issuer element
pac4j-saml/src/main/java/org/pac4j/saml/transport/Pac4jHTTPArtifactDecoder.java