setOutput(java.io.OutputStream, String) throws java.io.IOException; public void startDocument(String, Boolean) throws java.io.IOException; public void endDocument() throws java.io.IOException; public void setPrefix(String, String) throws java.io.IOException; protected String lookupOrDeclarePrefi(String); public String getPrefix(String, boolean); private String generatePrefix(String); public int getDepth(); public String getNamespace(); public String getName(); public XmlSerializer startTag(String, String) throws...

        {
            boolean found = false;

            for ( Plugin preExisting : getPlugins() )
            {
                if ( preExisting.getPrefix().equals( plugin.getPrefix() ) )
                {
                    found = true;
                    break;
                }
            }

            if ( !found )
            {

            LinkedHashMap<String, Plugin> mergedPlugins = new LinkedHashMap<>();
            recessivePlugins.forEach(p -> mergedPlugins.put(p.getPrefix(), p));
            plugins.forEach(p -> mergedPlugins.put(p.getPrefix(), p));
            metadata = metadata.withPlugins(mergedPlugins.values());
        }
        // just carry-on as-is
        if (recessive.getVersioning() != null) {