<?php
class MD_Resolution
{
	public $equScale;
	public $scaleDist;
}
class MD_Keywords
{
	public $keyword;
	public $keyTyp;
	public $thesaName;
}
class MD_BrowseGraphic
{
	public $bgFileName;
	public $bgFileDesc;
	public $bgFileType;
}
class MD_Identification
{
	public $idCitation;
	public $idAbs;
	public $idPurp;
	public $idCredit;
	public $idStatus;
	public $idPoc;
	public $resMaint;
	public $graphOver;
	public $dsFormat;
	public $descKeys;
	public $idSpecUse;
	public $resConst;
	public $aggrInfo;
	public $spatRpType;
	public $dataScale;
	public $dataLang;
	public $dataChar;
	public $tpCat;
	public $envirDesc;
	public $dataExt;
	public $suppInfo;
	public $SerIdent;
}
class MD_Metadata
{
	public $mdFileID;//string
	public $mdLang;//conditional, string
	public $mdChar; //conditional, class
	public $mdParentID;//string
	public $mdHrLv;//class array
	public $mdHrLvName;//string array
	public $mdContact;//class array
	public $mdDateSt;//class,数据创建时间
	public $mdStanName;//string
	public $mdStanVer;//string
	public $dataSetUri;//string
	public $spatRepInfo;//array association
	public $refSysInfo;//array..
	public $mdExtInfo;//array..
	public $dtaIdInfo;//array...MD_Identification
	public $contInfo; //array ..
	public $distInfo;//association
	public $dqInfo;//array ..
	public $porCatInfo;//array..
	public $mdConst;//array..
	public $appSchInfo;//array..
	public $mdMaint;//association
}
/**
* 采用DOM实现，需要PHP5
**/
class ISO19115
{
	public $mdFileID;
	public $mdLang;
	public $mdChar;
	public $mdDateSt;
	public $mdStanName='ISO 19115';
	public $mdStanVer='19115:2003';
	
	public $mdContact;
	public $uuid;
	public $doi='';
	/**
	* 数据集标题
	* 字符串
	**/
	public $resTitle;
	public $resAltTitle;
	/**
	* 数据集简介
	**/
	public $idAbs;
	public $dataSetURI;
	public $bgFileName;
	/**
	* 数据集序列信息
	* 数组
	**/
	public $datasetSeries;//array
	/**
	* 类别代码，数组
	* 注意在geonetwork中的不是代码，而是直接的类别值
	**/
	public $tpCat;
	/**
	* 时间信息，start & end
	* 注意：geonetwork中和国家元数据标准的代码不同
	* ISO 19115中好像没有看到相关信息
	**/
	public $timebegin;
	public $timeend;
	/**
	* 空间信息
	* 数组形式['w'],s,e,n
	**/
	public $geoBox;
	public $thumbnail;
	public $graph;
	public $keyword;
	
	private $dom;
	public $keytypecode=array(1=>'discipline','place','stratum','temporal','theme');
	public $author;
	public $error=array();
	public $xml;
	
	function __construct()
	{
		$this->dom = new DOMDocument();
	}
	/**
	* 从文件中读取元数据
	**/
	function load($file)
	{
		$this->dom->load($file);
		$this->parse();
	}
	/**
	* 从字符串中读取元数据
	*/
	function loadXML($str)
	{
		@$this->dom->loadXML($str);
		$this->xml=$str;
		$this->parse();
	}
	/**
	* 保存元数据到文件file中
	*/ 
	function save($file)
	{
		return $this->dom->save($file);
	}
	/**
	* 根据xml中的node保存为xml
	**/
	function saveXML($node="")
	{
		return $this->dom->saveXML($node);
	}
	/**
	* 根据UUID从数据库中提取元数据信息，不需要进行parse()操作
	**/
	function loadUUID($uuid)
	{
	}
	function saveDB($db,$xml='')
	{
		if (!empty($xml)) $this->loadXML($xml);
		//先删除已有元数据，然后再插入新数据
		$sql="delete from en.metadata where uuid=?";
		$db->query($sql,array($this->uuid));
		//删除所有未用到的responsible数据
		$sql="delete from en.responsible where id not in (select distinct(resid) from role)";
		pg_query($db,$sql);
		
		//if (!empty($this->doi)) $row->doi=$this->doi;
		//生成空白统计数据，可以转移到数据库端处理（todo）
		try
		{
			//$sql="insert into mdstat (uuid) values(?)";
			//$db->query($sql,array($this->uuid));
		} catch (Exception $e) {
			//do nothing.
			//说明数据库中已存在该信息
		}
		$dbmode=$db->getFetchMode();
		$db->setFetchMode(Zend_Db::FETCH_OBJ);
		//save metadata into database
		try {
			if ($this->refDate)
			{
				$sql="insert into en.metadata (uuid,title,title_en,description,citation,suppinfo,fileformat,projection,datatype,filesize,ts_created,
					timebegin,timeend,west,south,north,east,doi,ts_published) values(?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?)";
				$db->query($sql,array($this->uuid,$this->resTitle,$this->resAltTitle,$this->idAbs,$this->citation,$this->suppinfo,$this->fileformat,
								$this->projection,$this->datatype,$this->filesize,$this->mdDateSt,$this->timebegin,$this->timeend,$this->geoBox['w'],
								$this->geoBox['s'],$this->geoBox['n'],$this->geoBox['e'],$this->doi,$this->refDate));
			} else {
				$sql="insert into en.metadata (uuid,title,title_en,description,citation,suppinfo,fileformat,projection,datatype,filesize,ts_created,
					timebegin,timeend,west,south,north,east,doi) values(?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?)";
				$db->query($sql,array($this->uuid,$this->resTitle,$this->resAltTitle,$this->idAbs,$this->citation,$this->suppinfo,$this->fileformat,
								$this->projection,$this->datatype,$this->filesize,$this->mdDateSt,$this->timebegin,$this->timeend,$this->geoBox['w'],
								$this->geoBox['s'],$this->geoBox['n'],$this->geoBox['e'],$this->doi));
			}
			$id=$db->lastInsertId('en.metadata','id');
			//处理在线资源
			if ($this->onlineresource) foreach($this->onlineresource as $resource) 
			{
				$sql="insert into en.onlineresource (uuid,linkage,protocol,name,description) values(?,?,?,?,?)";
				if (!isset($resource['name'])) $resource['name']='';
				if (!isset($resource['description'])) $resource['description']='';
				$db->query($sql,array($this->uuid,$resource['linkage'],$resource['protocol'],$resource['name'],$resource['description']));
			}
			//处理缩略图
			if (!empty($this->thumbnail)) {
				$sql="insert into en.thumbnail (id,data,filetype) values(?,?,?)";
				$db->query($sql,array($id,$this->thumbnail,'jpg'));
			} elseif ($this->graph) {
				//$trow->data=$this->graph['data'];
				$sql="select id as gid from en.geonetworkmetadata where uuid=?";
				$r=$db->fetchRow($sql,array($this->uuid));
				if ($r)
				{
					$geonetwork='http://card.westgis.ac.cn/geonetwork/';
					$thumb=base64_encode(file_get_contents($geonetwork.'srv/cn/resources.get?access=public&id='.$r->gid.'&fname='.urlencode($this->graph['filename'])));
					$sql="insert into en.thumbnail (id,data,filetype,filedesc,filename) values(?,?,?,?,?)";
					$db->query($sql,array($id,$thumb,$this->graph['filetype'],$this->graph['filedesc'],$this->graph['filename']));
				}
			}
			//处理关键词
			//1:N relation
			foreach($this->keyword as $keytype=>$keys)
			{
				foreach($keys as $key)
				{
					$sql="insert into en.keyword (id,keyword,keytype) values(?,?,?)";
					try {
						$db->query($sql,array($id,$key,$keytype));
					} catch(Exception $e) {
						//忽略关键词错误
						}
				}
			}
			//处理数据集序列
			//M:N relation			
			if ($this->datasetSeries) foreach($this->datasetSeries as $ds) if (!empty($ds['seriesName']))
			{
				$sql="select id from en.series where name=?";
				$sth=$db->prepare($sql);
				$sth->execute(array($ds['seriesName']));
				$trow=$sth->fetch();
				if ($trow)
					$sid=$trow->id;
				else {
					$sql="insert into en.series (name) values(?)";
					$db->query($sql,array($ds['seriesName']));
					$sid=$db->lastInsertId('en.series','id');
				}
				$sql="insert into en.dataseries (id,sid) values(?,?)";
				$db->query($sql,array($id,$sid));
			}
			//处理数据分类
			foreach($this->tpCat as $cat){						
				if (is_numeric($cat)) {
					$sql="insert into en.category (id,code) values(?,?)";
					$db->query($sql,array($id,(int)$cat));
				} else {
					//是字符串，geonetwork会采用这种模式
					//从categorycode表中查找其对应的code
					$sql="insert into en.category (id,code) select ?,code from categorycode where name=?";
					$db->query($sql,array($id, trim($cat)));
				}
			}
			//处理联系人信息
			//先查询再进行处理
			//若用户信息发生变化，则存在问题
			//无法保证数据的更新状态
			foreach($this->author as $au)
			{
				$inds=explode(";",$au['individual']);
				foreach($inds as $ind)
				{
					$sql="select id from en.responsible where individual=? and organisation=?";
					$row=$db->fetchRow($sql,array(trim($ind),trim($au['organisation'])));
					if (!$row)
					{
						$sql="insert into en.responsible (individual,organisation,position,delivery,phone,email,city,country,administrative,postal) values(?,?,?,?,?,?,?,?,?,?)";
						$db->query($sql,array(trim($ind),trim($au['organisation']),trim($au['position']),trim($au['delivery']),trim($au['phone']),trim($au['email']),trim($au['city']),trim($au['country']),trim($au['administrative']),trim($au['postal'])));
					} elseif (count($inds)==1) {
						//deal email address
						if (($au['email']) && empty($row->email))
						{
							$sql="update en.responsible set email=? where id=?";
							$db->query($sql,array(trim($au['email']),$row->id));
						}
					}
					$sql="select id from en.responsible where individual=? and organisation=?";
					$row=$db->fetchRow($sql,array(trim($ind),trim($au['organisation'])));
					if ($row->id>0)
					{
						$sql="insert into en.role (resid,uuid,role) values(?,?,?)";
						$db->query($sql,array($row->id,$this->uuid,trim($au['role'])));
					}
				}
			}
			//处理数据限制信息
			foreach($this->limits as $uselimit)
			{
				$sql="select id from en.uselimit where uselimit=?";
				$row=$db->fetchRow($sql,array($uselimit));
				if (!$row)
				{
					$sql="insert into en.uselimit (uselimit) values (?)";
					$db->query($sql,array($uselimit));
				}
				$sql="select id from en.uselimit where uselimit=?";
				$row=$db->fetchRow($sql,array($uselimit));
				if ($row)
				{
					$sql="insert into en.mdlimit (uuid,lid) values(?,?)";
					$db->query($sql,array($this->uuid,$row->id));
				}
			}
			$this->save("/var/www/card.westgis.ac.cn/data/import/$this->uuid.xml");
			//处理XML入库
			if (!empty($xml)) $this->xml=$xml;
			$sql="insert into en.xml (id,data) values(?,?)";
			$db->query($sql,array($id,$this->xml));			
		}  catch (Exception $e) {
			//数据重复插入，此处忽略所有错误
			print $this->uuid.' has error: '.$e->getMessage().'<br />';
		}
		$db->setFetchMode($dbmode);	
	}
	
	//检查元数据的错误信息
	function validate()
	{
		//uuid
		if (empty($this->uuid)) $this->error[]='错误：数据的UUID不能为空！';
		if (empty($this->resTitle)) $this->error[]='错误：数据标题不能为空！';
		if (!is_numeric($this->filesize)) $this->error[]='错误：数据的大小（传输量）必须为数字，单位为MB！';
		//空间范围
		if (!is_numeric($this->geoBox['w']) || !is_numeric($this->geoBox['e']) || !is_numeric($this->geoBox['s']) ||!is_numeric($this->geoBox['n']))
		  $this->error[]='错误：数据的空间范围必须为数字格式的经纬度！';
		//时间范围
		if (!empty($this->timebegin) && !strtotime($this->timebegin))
		  $this->error[]='错误：数据的开始时间格式不正确！';
		if (!empty($this->timeend) && !strtotime($this->timeend))
		  $this->error[]='错误：数据的结束时间格式不正确！';
		//关键词不能有空白（即使关键词类型不一样）
		foreach($this->keyword as $k1=>$keyt)
		{
			foreach($keyt as $k2=>$keyword)
			{
				if (empty($keyword)) $this->error[]='错误：数据的关键词不能为空！';
				}
			}			
		//联系人必须有email地址？
		//todo
		
		//建议有缩略图
		if (empty($this->graph)) $this->error[]='建议：请提供一张能反应或代表数据的图片（800像素以上）。';
		return count($this->error);
	}
		
	function parse()
	{
		$this->resTitle=$this->dom->getElementsByTagName('resTitle')->item(0)->nodeValue;
		@$this->resAltTitle=$this->dom->getElementsByTagName('resAltTitle')->item(0)->nodeValue;
		$this->idAbs=$this->dom->getElementsByTagName('idAbs')->item(0)->nodeValue;
		$this->mdFileID=$this->dom->getElementsByTagName('mdFileID')->item(0)->nodeValue;
		$this->mdDateSt=$this->dom->getElementsByTagName('mdDateSt')->item(0)->nodeValue;
		@$this->dataSetURI=$this->dom->getElementsByTagName('dataSetURI')->item(0)->nodeValue;
		//引用说明
		@$this->citation=$this->dom->getElementsByTagName('otherCitDet')->item(0)->nodeValue;
		//项目支持信息
		@$this->suppinfo=$this->dom->getElementsByTagName('suppInfo')->item(0)->nodeValue;
		//DOI，自定义项
		$cittype=$this->dom->getElementsByTagName('citIdType')->item(0)->nodeValue;
		if ($cittype=='DOI')
			$this->doi=$this->dom->getElementsByTagName('citId')->item(0)->nodeValue;
		//数据大小，以MB为单位
		@$this->filesize=$this->dom->getElementsByTagName('transSize')->item(0)->nodeValue;
		//数据格式，可以多个，但此处只用一个？
		@$this->fileformat=$this->dom->getElementsByTagName('formatName')->item(0)->nodeValue;
		//投影类型，可以多个，但只选一个
		@$this->projection=$this->dom->getElementsByTagName('identCode')->item(0)->nodeValue;
		//数据限制信息
		$limits=$this->dom->getElementsByTagName('useLimit');
		foreach($limits as $limit)
		{
			$this->limits[]=$limit->nodeValue;
		}
		//数据作者
		$authors=$this->dom->getElementsByTagName('citRespParty');
		foreach($authors as $k=>$author)
		{
			$this->author[$k]['individual']=$author->getElementsByTagName('rpIndName')->item(0)->nodeValue;
			$this->author[$k]['organisation']=$author->getElementsByTagName('rpOrgName')->item(0)->nodeValue;
			@$this->author[$k]['position']=$author->getElementsByTagName('rpPosName')->item(0)->nodeValue;
			@$this->author[$k]['delivery']=$author->getElementsByTagName('delPoint')->item(0)->nodeValue;
			@$this->author[$k]['phone']=$author->getElementsByTagName('voiceNum')->item(0)->nodeValue;
			@$this->author[$k]['email']=$author->getElementsByTagName('eMailAdd')->item(0)->nodeValue;
			$this->author[$k]['postal']=$author->getElementsByTagName('postCode')->item(0)->nodeValue;
			$this->author[$k]['city']=$author->getElementsByTagName('city')->item(0)->nodeValue;
			$this->author[$k]['administrative']=$author->getElementsByTagName('adminArea')->item(0)->nodeValue;
			@$this->author[$k]['country']=$author->getElementsByTagName('country')->item(0)->nodeValue;
			@$this->author[$k]['role']=$author->getElementsByTagName('RoleCd')->item(0)->attributes->getNamedItem('value')->nodeValue;
		}
		$cnt=$k+1;
		$authors=$this->dom->getElementsByTagName('mdContact');
		foreach($authors as $j=>$author)
		{
			$this->author[$cnt+$j]['individual']=$author->getElementsByTagName('rpIndName')->item(0)->nodeValue;
			$this->author[$cnt+$j]['organisation']=$author->getElementsByTagName('rpOrgName')->item(0)->nodeValue;
			@$this->author[$cnt+$j]['position']=$author->getElementsByTagName('rpPosName')->item(0)->nodeValue;
			@$this->author[$cnt+$j]['delivery']=$author->getElementsByTagName('delPoint')->item(0)->nodeValue;
			@$this->author[$cnt+$j]['phone']=$author->getElementsByTagName('voiceNum')->item(0)->nodeValue;
			@$this->author[$cnt+$j]['email']=$author->getElementsByTagName('eMailAdd')->item(0)->nodeValue;
			$this->author[$cnt+$j]['postal']=$author->getElementsByTagName('postCode')->item(0)->nodeValue;
			$this->author[$cnt+$j]['city']=$author->getElementsByTagName('city')->item(0)->nodeValue;
			$this->author[$cnt+$j]['administrative']=$author->getElementsByTagName('adminArea')->item(0)->nodeValue;
			@$this->author[$cnt+$j]['country']=$author->getElementsByTagName('country')->item(0)->nodeValue;
			$this->author[$cnt+$j]['role']=$author->getElementsByTagName('RoleCd')->item(0)->attributes->getNamedItem('value')->nodeValue;
		}
		$cnt+=$j+1;
		$authors=$this->dom->getElementsByTagName('distorCont');
		foreach($authors as $m=>$author)
		{
			$this->author[$cnt+$m]['individual']=$author->getElementsByTagName('rpIndName')->item(0)->nodeValue;
			$this->author[$cnt+$m]['organisation']=$author->getElementsByTagName('rpOrgName')->item(0)->nodeValue;
			@$this->author[$cnt+$m]['position']=$author->getElementsByTagName('rpPosName')->item(0)->nodeValue;
			@$this->author[$cnt+$m]['delivery']=$author->getElementsByTagName('delPoint')->item(0)->nodeValue;
			@$this->author[$cnt+$m]['phone']=$author->getElementsByTagName('voiceNum')->item(0)->nodeValue;
			@$this->author[$cnt+$m]['email']=$author->getElementsByTagName('eMailAdd')->item(0)->nodeValue;
			$this->author[$cnt+$m]['postal']=$author->getElementsByTagName('postCode')->item(0)->nodeValue;
			$this->author[$cnt+$m]['city']=$author->getElementsByTagName('city')->item(0)->nodeValue;
			$this->author[$cnt+$m]['administrative']=$author->getElementsByTagName('adminArea')->item(0)->nodeValue;
			@$this->author[$cnt+$m]['country']=$author->getElementsByTagName('country')->item(0)->nodeValue;
			$this->author[$cnt+$m]['role']=$author->getElementsByTagName('RoleCd')->item(0)->attributes->getNamedItem('value')->nodeValue;
		}		
		$cnt+=$m+1;
		$authors=$this->dom->getElementsByTagName('idPoC');
		foreach($authors as $m=>$author)
		{
			$this->author[$cnt+$m]['individual']=$author->getElementsByTagName('rpIndName')->item(0)->nodeValue;
			$this->author[$cnt+$m]['organisation']=$author->getElementsByTagName('rpOrgName')->item(0)->nodeValue;
			@$this->author[$cnt+$m]['position']=$author->getElementsByTagName('rpPosName')->item(0)->nodeValue;
			$this->author[$cnt+$m]['delivery']=$author->getElementsByTagName('delPoint')->item(0)->nodeValue;
			$this->author[$cnt+$m]['phone']=$author->getElementsByTagName('voiceNum')->item(0)->nodeValue;
			$this->author[$cnt+$m]['email']=$author->getElementsByTagName('eMailAdd')->item(0)->nodeValue;
			$this->author[$cnt+$m]['postal']=$author->getElementsByTagName('postCode')->item(0)->nodeValue;
			$this->author[$cnt+$m]['city']=$author->getElementsByTagName('city')->item(0)->nodeValue;
			$this->author[$cnt+$m]['administrative']=$author->getElementsByTagName('adminArea')->item(0)->nodeValue;
			$this->author[$cnt+$m]['country']=$author->getElementsByTagName('country')->item(0)->nodeValue;
			$this->author[$cnt+$m]['role']=$author->getElementsByTagName('RoleCd')->item(0)->attributes->getNamedItem('value')->nodeValue;
		}
		/*
		foreach($authors as $author)
		{
			if($author->getElementsByTagName('rpIndName')->item(0) && 
					$author->getElementsByTagName('RoleCd')->item(0) &&
					$author->getElementsByTagName('RoleCd')->item(0)->hasAttributes() &&
					$author->getElementsByTagName('RoleCd')->item(0)->attributes->getNamedItem('value')->nodeValue=="author")
			{
				$this->author=$author->getElementsByTagName('rpIndName')->item(0)->nodeValue;
				break;
			}elseif ($author->getElementsByTagName('rpIndName')->item(0) && 
					$author->getElementsByTagName('RoleCd')->item(0) &&
					$author->getElementsByTagName('RoleCd')->item(0)->hasAttributes() &&
					$author->getElementsByTagName('RoleCd')->item(0)->attributes->getNamedItem('value')->nodeValue=="originator" )
			{
				$this->author=$author->getElementsByTagName('rpIndName')->item(0)->nodeValue;
				break;
			}elseif ($author->getElementsByTagName('rpIndName')->item(0) && 
					$author->getElementsByTagName('RoleCd')->item(0) &&
					$author->getElementsByTagName('RoleCd')->item(0)->hasAttributes() &&
					$author->getElementsByTagName('RoleCd')->item(0)->attributes->getNamedItem('value')->nodeValue=="owner" )
			{
				$this->author=$author->getElementsByTagName('rpIndName')->item(0)->nodeValue;
				break;
			}elseif ($author->getElementsByTagName('rpIndName')->item(0) && 
					$author->getElementsByTagName('RoleCd')->item(0) &&
					$author->getElementsByTagName('RoleCd')->item(0)->hasAttributes() &&
					$author->getElementsByTagName('RoleCd')->item(0)->attributes->getNamedItem('value')->nodeValue=="processor" )
			{
				$this->author=$author->getElementsByTagName('rpIndName')->item(0)->nodeValue;
				break;
			}elseif ($author->getElementsByTagName('rpIndName')->item(0) && 
					$author->getElementsByTagName('RoleCd')->item(0) &&
					$author->getElementsByTagName('RoleCd')->item(0)->hasAttributes() &&
					$author->getElementsByTagName('RoleCd')->item(0)->attributes->getNamedItem('value')->nodeValue=="publisher" )
			{
				$this->author=$author->getElementsByTagName('rpIndName')->item(0)->nodeValue;
				break;
			}elseif ($author->getElementsByTagName('rpIndName')->item(0) && 
					$author->getElementsByTagName('RoleCd')->item(0) &&
					$author->getElementsByTagName('RoleCd')->item(0)->hasAttributes() &&
					$author->getElementsByTagName('RoleCd')->item(0)->attributes->getNamedItem('value')->nodeValue=="resourceProvider" )
			{
				$this->author=$author->getElementsByTagName('rpIndName')->item(0)->nodeValue;
				break;
			}
		}
		*/		
		//数据类型，在线或离线
		$this->datatype=0;
		$onlinesrc=$this->dom->getElementsByTagName('onLineSrc');
		foreach($onlinesrc as $k=>$src)
		{
			if ($src->getElementsByTagName('OnFunctCd')->item(0) 
			&& $src->getElementsByTagName('OnFunctCd')->item(0)->hasAttributes()
			 && $src->getElementsByTagName('OnFunctCd')->item(0)->attributes->getNamedItem('value')->nodeValue=="offlineAccess")
			  $this->datatype=1;
			{
				//在线资源
				$this->onlineresource[$k]['linkage']=$src->getElementsByTagName('linkage')->item(0)->nodeValue;
				if ($src->getElementsByTagName('protocol')->item(0)) $this->onlineresource[$k]['protocol']=$src->getElementsByTagName('protocol')->item(0)->nodeValue;
				if ($src->getElementsByTagName('orName')->item(0)) $this->onlineresource[$k]['name']=$src->getElementsByTagName('orName')->item(0)->nodeValue;
				$this->onlineresource[$k]['description']=$src->getElementsByTagName('orDesc')->item(0)->nodeValue;
			}
		}
		$cats=$this->dom->getElementsByTagName('tpCat');
		foreach($cats as $cat)
		{
			if ($cat->getElementsByTagName('TopicCatCd')->item(0)->hasAttributes())
				$this->tpCat[]=$cat->getElementsByTagName('TopicCatCd')->item(0)->attributes->getNamedItem('value')->nodeValue;
		}
		@$this->bgFileName=$this->dom->getElementsByTagName('bgFileName')->item(0)->nodeValue;
		$keywords=$this->dom->getElementsByTagName('descKeys');//Keywords? which one?
		foreach($keywords as $keys)
		{
			if ($keys->getElementsByTagName('KeyTypCd')->item(0) && $keys->getElementsByTagName('KeyTypCd')->item(0)->hasAttributes())
				$k=$keys->getElementsByTagName('KeyTypCd')->item(0)->attributes->getNamedItem('value')->nodeValue;
			if (is_numeric($k))
				$kt=$this->keytypecode[(int)$k];
			else
				$kt=$k;
			//如果没有找到类别，则默认为主题关键词
			if (!$kt) $kt=$this->keytypecode[5];
			$ks=$keys->getElementsByTagName('keyword');
			foreach($ks as $key)
			{
				//处理特殊情况:多关键词输入在一起，用一些符号来分割，如分号等。
				$pos=strpos($key->nodeValue,';');
				if ($pos===false) 
					$this->keyword[$kt][]=$key->nodeValue;
				else {
					$str=explode(';',$key->nodeValue);
					foreach($str as $s){
						$this->keyword[$kt][]=$s;
					}
				}
			}
		}
		//resRefDate
		$refdates=$this->dom->getElementsByTagName('resRefDate');
		foreach($refdates as $refdate)
		{
			if ($refdate->getElementsByTagName('DateTypCd')->item(0) && $refdate->getElementsByTagName('DateTypCd')->item(0)->hasAttributes()  && $refdate->getElementsByTagName('DateTypCd')->item(0)->attributes->getNamedItem('value')->nodeValue=="publication")
			{
				$this->refDate=$refdate->getElementsByTagName('refDate')->item(0)->nodeValue;
			}
		}
		//in ISO 19115 draft.
		$ds=$this->dom->getElementsByTagName('datasetSeries');
		foreach($ds as $k=>$dataset)
		{
		  $this->datasetSeries[$k]['seriesName']=$dataset->getElementsByTagName('seriesName')->item(0)->nodeValue;
		  @$this->datasetSeries[$k]['issId']=$dataset->getElementsByTagName('issId')->item(0)->nodeValue;
		  @$this->datasetSeries[$k]['artPage']=$dataset->getElementsByTagName('artPage')->item(0)->nodeValue;
		}
		//unsure which one.
		$ds=$this->dom->getElementsByTagName('Series');
		foreach($ds as $k=>$dataset)
		{
		  $this->datasetSeries[$k]['seriesName']=$dataset->getElementsByTagName('Name')->item(0)->nodeValue;
		  $this->datasetSeries[$k]['issId']=$dataset->getElementsByTagName('issId')->item(0)->nodeValue;
		  $this->datasetSeries[$k]['artPage']=$dataset->getElementsByTagName('artPage')->item(0)->nodeValue;
		}
		//可能只适用于ESRI ARCCATELOG产生的元数据
		$extent=$this->dom->getElementsByTagName('geoBox');
		foreach($extent as $geo)
		{
			$this->geoBox['w']=$geo->getElementsByTagName('westBL')->item(0)->nodeValue;
			$this->geoBox['s']=$geo->getElementsByTagName('southBL')->item(0)->nodeValue;
			$this->geoBox['e']=$geo->getElementsByTagName('eastBL')->item(0)->nodeValue;
			$this->geoBox['n']=$geo->getElementsByTagName('northBL')->item(0)->nodeValue;		
		}
		//提取ESRI格式中的UUID
		if (empty($this->uuid))
		{
			@$this->uuid=$this->dom->getElementsByTagName('MetaID')->item(0)->nodeValue;
			//剔除前后大括号			
			$this->uuid=trim($this->uuid,'{');
			$this->uuid=trim($this->uuid,'}');
		}
		//根据mdFileID来判断uuid
		//如果mdFileID为uuid的组织形式，则进行提取
		if (strlen(trim($this->mdFileID))==36 && empty($this->uuid))
			$this->uuid=trim($this->mdFileID);
		//仍然没有UUID信息，则创建一个
		if (empty($this->uuid))
		{
			$this->uuid=new uuid();
			$this->uuid=$this->uuid->toString();
			//反馈回XML文件
			$mdfile=$this->dom->getElementsByTagName('mdFileID');
			if ($mdfile->length>0) {
				$this->dom->getElementsByTagName('mdFileID')->item(0)->nodeValue=$this->uuid;
			} else {
				$mdfile=$this->dom->createElement('mdFileID', $this->uuid);
				$this->dom->getElementsByTagName('Metadata')->item(0)->appendChild($mdfile);
			}
		}
		//提取时间信息
		$tm_period=$this->dom->getElementsByTagName('TM_Period');
		foreach($tm_period as $period)
		{
			$this->timebegin=$period->getElementsByTagName('begin')->item(0)->nodeValue;
			$this->timeend=$period->getElementsByTagName('end')->item(0)->nodeValue;
		}
		$tm_day=$this->dom->getElementsByTagName('TM_CalDate');
		foreach($tm_day as $day)
		{
			$this->timebegin=$day->getElementsByTagName('calDate')->item(0)->nodeValue;
		}
		//Todo:处理缩略图，限制为一个。
		//$thumb=$this->dom->getElementsByTagName('Thumbnail');
		$xpath = new DOMXPath($this->dom);	
		$query = '//metadata/Binary/Thumbnail/Data';//should be Metadata
		$entries = $xpath->query($query);
		if ($entries->length>0)
			$this->thumbnail=$entries->item(0)->nodeValue;
		else {
			$query='//Metadata/Binary/Thumbnail/Data';
			$entries=$xpath->query($query);
			@$this->thumbnail=$entries->item(0)->nodeValue;
		}
		//如果是从GEONETWORK获取，判断是否已有缩略图，获取最小的缩略图
		$graphs=$this->dom->getElementsByTagName('graphOver');
		foreach ($graphs as $g)
		{
			if ($g->getElementsByTagName('bgFileDesc')->item(0)->nodeValue=='thumbnail') {
				$this->graph['filename']=$g->getElementsByTagName('bgFileName')->item(0)->nodeValue;
				$this->graph['filedesc']='thumbnail';
				$this->graph['filetype']=$g->getElementsByTagName('bgFileType')->item(0)->nodeValue;
			}
		}
	}	
}
?>