*/
    @Override
    protected Pattern getTagPattern() {
        // not used
        return null;
    }

    public void addFeature(final String key, final String value) {
        if (StringUtil.isBlank(key) || StringUtil.isBlank(value)) {
            throw new CrawlerSystemException("key or value is null.");
        }

        }

        final Matcher matcher = invalidUrlPattern.matcher(path);
        if (matcher.find()) {
            return false;
        }

        return true;
    }

    public void addFeature(final String key, final String value) {
        if (StringUtil.isBlank(key) || StringUtil.isBlank(value)) {
            throw new CrawlerSystemException("key or value is null.");
        }

        }
        return value;
    }

    public void addAttribute(final String name, final Object value) {
        attributeMap.put(name, value);
    }

    public void addFeature(final String key, final String value) {
        featureMap.put(key, value);
    }

    public void addFieldRule(final String name, final String xpath) {
        fieldRuleMap.put(name, xpath);
    }

if(this.is){this.is=this.is.toLowerCase();}}});Polymer.Base._addFeature({behaviors:[],_desugarBehaviors:function(){if(this.behaviors.length){this.behaviors=this._d...