xml_persistent — returns an entity object ('XPER entity') created from given XML document


xml_persistent ( in document varchar ,
  in parser_mode integer ,
  in base_uri varchar ,
  in content_encoding varchar ,
  in content_language varchar ,
  in dtd_validator_config varchar );


This parses the argument, which is expected to be a well formed XML fragment and returns a parse tree as a special object with underlying disk structure, named "persistent XML" or "XPER" While the result of xml_tree() is a memory-resident array of vectors, the XPER object consumes only a little amount of memory, and almost all data is disk-resident.

This function is equivalent to xper_doc() , and the only difference is in the order of arguments; xper_doc() has the same order of arguments as xml_tree() .



well formed XML or HTML documen


0, 1 or 2; 0 - XML parser mode, 1 - HTML parser mode, 2 - 'dirty HTML' mode (with quiet recovery after any syntax error)


in HTML parser mode change all absolute references to relative from given base_uri (http://<host>:<port>/<path>)


string with content encoding type of <document>; valid are 'ASCII', 'ISO', 'UTF8', 'ISO8859-1', 'LATIN-1' etc., defaults are 'UTF-8' for XML mode and 'LATIN-1' for HTML mode


string with language tag of content of <document>; valid names are listed in IETF RFC 1766, default is 'x-any' (it means 'mix of words from various human languages)


configuration string for the DTD validator, default is empty string meaning that DTD validator should be fully disabled. See Configuration Options of the DTD Validator for details.

Return Types

Parse tree as a structure of nested heterogeneous vectors.


Example 24.516. XML_Persistent

declare tree any;

tree := xml_persistent (file_to_string ('doc.html'), 1,
                'http://localhost.localdomain/', 'ISO');
tree := xml_persistent (file_to_string ('doc.xml'));