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一个非常好用而且强大的基于xpath的html解析器。html的DOM树生成依赖Jsoup。Lexer 和 Parser基于Antlr4,支持完备的W3C XPATH 1.0标准语法，W3C规范：http://www.w3.org/TR/1999/REC-xpath-19991116。

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package cn.wanghaomiao.xpath.util;

/**
 * 筛选作用域
 * @author 汪浩淼 [ [email protected] ]
 * @since 14-3-7 下午4:26
 */
public enum ScopeEm {
    INCHILREN("/"),   //默认只在子代中筛选,有轴时由轴定义筛选域
    RECURSIVE("//"),  //向下递归查找
    CUR("./"),        //当前节点下
    CURREC(".//");    //当前节点向下递归
    private String val;
    private ScopeEm(String type){
        this.val = type;
    }
    public String val() {
        return this.val;
    }
}