r $sqlArray;
	
	/**
	* @var object	ADOdb connection object
	* @access private
	*/
	var $db;
	
	/**
	* @var object	ADOdb Data Dictionary
	* @access private
	*/
	var $dict;
	
	/**
	* @var string Current XML element
	* @access private
	*/
	var $currentElement = '';
	
	/**
	* @var string If set (to 'ALTER' or 'REPLACE'), upgrade an existing database
	* @access private
	*/
	var $upgrade = '';
	
	/**
	* @var string Optional object prefix
	* @access private
	*/
	var $objectPrefix = '';
	
	/**
	* @var long	Original Magic Quotes Runtime value
	* @access private
	*/
	var $mgq;
	
	/**
	* @var long	System debug
	* @access private
	*/
	var $debug;
	
	/**
	* @var string Regular expression to find schema version
	* @access private
	*/
	var $versionRegex = '/<schema.*?( version="([^"]*)")?.*?>/';
	
	/**
	* @var string Current schema version
	* @access private
	*/
	var $schemaVersion;
	
	/**
	* @var int	Success of last Schema execution
	*/
	var $success;
	
	/**
	* @var bool	Execute SQL inline as it is generated
	*/
	var $executeInline;
	
	/**
	* @var bool	Continue SQL execution if errors occur
	*/
	var $continueOnError;
	
	/**
	* Creates an adoSchema object
	*
	* Creating an adoSchema object is the first step in processing an XML schema.
	* The only parameter is an ADOdb database connection object, which must already
	* have been created.
	*
	* @param object $db ADOdb database connection object.
	*/
	function adoSchema( &$db ) {
		// Initialize the environment
		$this->mgq = get_magic_quotes_runtime();
		set_magic_quotes_runtime(0);
		
		$this->db =& $db;
		$this->debug = $this->db->debug;
		$this->dict = NewDataDictionary( $this->db );
		$this->sqlArray = array();
		$this->schemaVersion = XMLS_SCHEMA_VERSION;
		$this->executeInline( XMLS_EXECUTE_INLINE );
		$this->continueOnError( XMLS_CONTINUE_ON_ERROR );
		$this->setUpgradeMethod();
	}
	
	/**
	* Sets the method to be used for upgrading an existing database
	*
	* Use this method to specify how existing database objects should be upgraded.
	* The method option can be set to ALTER, REPLACE, BEST, or NONE. ALTER attempts to
	* alter each database object directly, REPLACE attempts to rebuild each object
	* from scratch, BEST attempts to determine the best upgrade method for each
	* object, and NONE disables upgrading.
	*
	* This method is not yet used by AXMLS, but exists for backward compatibility.
	* The ALTER method is automatically assumed when the adoSchema object is
	* instantiated; other upgrade methods are not currently supported.
	*
	* @param string $method Upgrade method (ALTER|REPLACE|BEST|NONE)
	* @returns string Upgrade method used
	*/
	function SetUpgradeMethod( $method = '' ) {
		if( !is_string( $method ) ) {
			return FALSE;
		}
		
		$method = strtoupper( $method );
		
		// Handle the upgrade methods
		switch( $method ) {
			case 'ALTER':
				$this->upgrade = $method;
				break;
			case 'REPLACE':
				$this->upgrade = $method;
				break;
			case 'BEST':
				$this->upgrade = 'ALTER';
				break;
			case 'NONE':
				$this->upgrade = 'NONE';
				break;
			default:
				// Use default if no legitimate method is passed.
				$this->upgrade = XMLS_DEFAULT_UPGRADE_METHOD;
		}
		
		return $this->upgrade;
	}
	
	/**
	* Enables/disables inline SQL execution.
	*
	* Call this method to enable or disable inline execution of the schema. If the mode is set to TRUE (inline execution),
	* AXMLS applies the SQL to the database immediately as each schema entity is parsed. If the mode
	* is set to FALSE (post execution), AXMLS parses the entire schema and you will need to call adoSchema::ExecuteSchema()
	* to apply the schema to the database.
	*
	* @param bool $mode execute
	* @return bool current execution mode
	*
	* @see ParseSchema(), ExecuteSchema()
	*/
	function ExecuteInline( $mode = NULL ) {
		if( is_bool( $mode ) ) {
			$this->executeInline = $mode;
		}
		
		return $this->executeInline;
	}
	
	/**
	* Enables/disables SQL continue on error.
	*
	* Call this method to enable or disable continuation of SQL execution if an error occurs.
	* If the mode is set to TRUE (continue), AXMLS will continue to apply SQL to the database, even if an error occurs.
	* If the mode is set to FALSE (halt), AXMLS will halt execution of generated sql if an error occurs, though parsing
	* of the schema will continue.
	*
	* @param bool $mode execute
	* @return bool current continueOnError mode
	*
	* @see addSQL(), ExecuteSchema()
	*/
	function ContinueOnError( $mode = NULL ) {
		if( is_bool( $mode ) ) {
			$this->continueOnError = $mode;
		}
		
		return $this->continueOnError;
	}
	
	/**
	* Loads an XML schema from a file and converts it to SQL.
	*
	* Call this method to load the specified schema (see the DTD for the proper format) from
	* the filesystem and generate the SQL necessary to create the database described. 
	* @see ParseSchemaString()
	*
	* @param string $file Name of XML schema file.
	* @param bool $returnSchema Return schema rather than parsing.
	* @return array Array of SQL queries, ready to execute
	*/
	function ParseSchema( $filename, $returnSchema = FALSE ) {
		return $this->ParseSchemaString( $this->ConvertSchemaFile( $filename ), $returnSchema );
	}
	
	/**
	* Loads an XML schema from a file and converts it to SQL.
	*
	* Call this method to load the specified schema from a file (see the DTD for the proper format) 
	* and generate the SQL necessary to create the database described by the schema.
	*
	* @param string $file Name of XML schema file.
	* @param bool $returnSchema Return schema rather than parsing.
	* @return array Array of SQL queries, ready to execute.
	*
	* @deprecated Replaced by adoSchema::ParseSchema() and adoSchema::ParseSchemaString()
	* @see ParseSchema(), ParseSchemaString()
	*/
	function ParseSchemaFile( $filename, $returnSchema = FALSE ) {
		// Open the file
		if( !($fp = fopen( $filename, 'r' )) ) {
			// die( 'Unable to open file' );
			return FALSE;
		}
		
		// do version detection here
		if( $this->SchemaFileVersion( $filename ) != $this->schemaVersion ) {
			return FALSE;
		}
		
		if ( $returnSchema )
		{
			$xmlstring = '';
			while( $data = fread( $fp, 100000 ) ) {
				$xmlstring .= $data;
			}
			return $xmlstring;
		}
		
		$this->success = 2;
		
		$xmlParser = $this->create_parser();
		
		// Process the file
		while( $data = fread( $fp, 4096 ) ) {
			if( !xml_parse( $xmlParser, $data, feof( $fp ) ) ) {
				die( sprintf(
					"XML error: %s at line %d",
					xml_error_string( xml_get_error_code( $xmlParser) ),
					xml_get_current_line_number( $xmlParser)
				) );
			}
		}
		
		xml_parser_free( $xmlParser );
		
		return $this->sqlArray;
	}
	
	/**
	* Converts an XML schema string to SQL.
	*
	* Call this method to parse a string containing an XML schema (see the DTD for the proper format)
	* and generate the SQL necessary to create the database described by the schema. 
	* @see ParseSchema()
	*
	* @param string $xmlstring XML schema string.
	* @param bool $returnSchema Return schema rather than parsing.
	* @return array Array of SQL queries, ready to execute.
	*/
	function ParseSchemaString( $xmlstring, $returnSchema = FALSE ) {
		if( !is_string( $xmlstring ) OR empty( $xmlstring ) ) {
			return FALSE;
		}
		
		// do version detection here
		if( $this->SchemaStringVersion( $xmlstring ) != $this->schemaVersion ) {
			return FALSE;
		}
		
		if ( $returnSchema )
		{
			return $xmlstring;
		}
		
		$this->success = 2;
		
		$xmlParser = $this->create_parser();
		
		if( !xml_parse( $xmlParser, $xmlstring, TRUE ) ) {
			die( sprintf(
				"XML error: %s at line %d",
				xml_error_string( xml_get_error_code( $xmlParser) ),
				xml_get_current_line_number( $xmlParser)
			) );
		}
		
		xml_parser_free( $xmlParser );
		
		return $this->sqlArray;
	}
	
	/**
	* Loads an XML schema from a file and converts it to uninstallation SQL.
	*
	* Call this method to load the specified schema (see the DTD for the proper format) from
	* the filesystem and generate the SQL necessary to remove the database described.
	* @see RemoveSchemaString()
	*
	* @param string $file Name of XML schema file.
	* @param bool $returnSchema Return schema rather than parsing.
	* @return array Array of SQL queries, ready to execute
	*/
	function RemoveSchema( $filename, $returnSchema = FALSE ) {
		return $this->RemoveSchemaString( $this->ConvertSchemaFile( $filename ), $returnSchema );
	}
	
	/**
	* Converts an XML schema string to uninstallation SQL.
	*
	* Call this method to parse a string containing an XML schema (see the DTD for the proper format)
	* and generate the SQL necessary to uninstall the database described by the schema. 
	* @see RemoveSchema()
	*
	* @param string $schema XML schema string.
	* @param bool $returnSchema Return schema rather than parsing.
	* @return array Array of SQL queries, ready to execute.
	*/
	function RemoveSchemaString( $schema, $returnSchema = FALSE ) {
		
		// grab current version
		if( !( $version = $this->SchemaStringVersion( $schema ) ) ) {
			return FALSE;
		}
		
		return $this->ParseSchemaString( $this->TransformSchema( $schema, 'remove-' . $version), $returnSchema );
	}
	
	/**
	* Applies the current XML schema to the database (post execution).
	*
	* Call this method to apply the current schema (generally created by calling 
	* ParseSchema() or ParseSchemaString() ) to the database (creating the tables, indexes, 
	* and executing other SQL specified in the schema) after parsing.
	* @see ParseSchema(), ParseSchemaString(), Ex