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Oracle® Database PL/SQL Packages and Types Reference
11g Release 1 (11.1)

B28419-03
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165 DBMS_XSLPROCESSOR

The DBMS_XSLPROCESSOR package provides an interface to manage the contents and structure of XML documents.

This chapter contains the following topics:


Using DBMS_XSLPROCESSOR

This section contains topics which relate to using the DBMS_XSLPROCESSOR package.


Overview

The DBMS_XSLPROCESSOR package provides an interface to manage the contents and structure of XML documents.

Standards

This PL/SQL implementation of the XSL processor follows the W3C XSLT working draft rev WD-xslt-19990813 and includes the required behavior of an XSL processor in terms of how it must read XSLT stylesheets and the transformation it must effect.

Concepts

The Extensible Stylesheet Language Transformation (XSLT) describes rules for transforming a source tree into a result tree. A transformation expressed in XSLT is called a stylesheet. The transformation specified is achieved by associating patterns with templates defined in the stylesheet. A template is instantiated to create part of the result tree.

Implementation

The following is the default behavior for this PL/SQL XSL Processor:


Summary of DBMS_XSLPROCESSOR Subprograms

Table 165-1 DBMS_XSLPROCESSOR Package Subprograms

Method Description

CLOB2FILE Procedure

Writes content of a CLOB into a file

FREEPROCESSOR Procedure

Frees a processor object

FREESTYLESHEET Procedure

Frees a stylesheet object

NEWPROCESSOR Function

Returns a new processor instance

NEWSTYLESHEET Functions

Creates a new stylesheet from input and reference URLs

PROCESSXSL Functions and Procedures

Transforms an input XML document

READ2CLOB Function

Reads content of the file into a CLOB

REMOVEPARAM Procedure

Removes a top-level stylesheet parameter

RESETPARAMS Procedure

Resets the top-level stylesheet parameters

SELECTNODES Function

Selects nodes from a DOM tree that match a pattern

SELECTSINGLENODE Function

Selects the first node from the tree that matches a pattern

SETERRORLOG Procedure

Sets errors to be sent to the specified file

SETPARAM Procedure

Sets a top-level parameter in the stylesheet

SHOWWARNINGS Procedure

Turns warnings on or off

TRANSFORMNODE Function

Transforms a node in a DOM tree using a stylesheet

VALUEOF Function and Procedure

Gets the value of the first node that matches a pattern



CLOB2FILE Procedure

This procedure writes content of a CLOB into a file.

Syntax

DBMS_XSLPROCESSOR.CLOB2FILE(
  cl          IN  CLOB;
  flocation   IN  VARCHAR2,
  fname       IN  VARCHAR2,
  csid        IN  NUMBER:=0);

Parameters

Table 165-2 CLOB2FILE Procedure Parameters

Parameter Description

CLOB

File directory

flocation

File directory

fname

File name

csid

Character set id of the file

  • Must be a valid Oracle id; otherwise returns an error

  • If 0, content of the output file will be in the database character set



FREEPROCESSOR Procedure

This procedure Frees a Processor object.

Syntax

DBMS_XSLPROCESSOR.FREEPROCESSOR(
  p  IN  Processor);

Parameters

Table 165-3 FREEPROCESSOR Procedure Parameters

Parameter Description

p

Processor



FREESTYLESHEET Procedure

This procedure frees a Stylesheet object.

Syntax

DBMS_XSLPROCESSOR.FREESTYLESHEET(
  ss  IN  Stylesheet);

Parameters

Table 165-4 FREESTYLESHEET Procedure Parameters

Parameter Description

ss

Stylesheet



NEWPROCESSOR Function

This function returns a new Processor instance. The function must be called before the default behavior of Processor can be changed and if other processor methods need to be used.

Syntax

DBMS_XSLPROCESSOR.NEWPROCESSOR
 RETURN Processor;

NEWSTYLESHEET Functions

This function creates and returns a new Stylesheet instance. The options are described in the following table.

Syntax

Creates and returns a new stylesheet instance using the given DOMDOCUMENT and reference URLs:

DBMS_XSLPROCESSOR.NEWSTYLESHEET(
   xmldoc  IN   DOMDOCUMENT,
   ref     IN   VARCHAR2) 
 RETURN Stylesheet;

Creates and returns a new Stylesheet instance using the given input and reference URLs:

DBMS_XSLPROCESSOR.NEWSTYLESHEET(
   inp    IN   VARCHAR2,
   ref    IN   VARCHAR2) 
 RETURN Stylesheet;

Parameters

Table 165-5 NEWSTYLESHEET Function Parameters

Parameter Description

xmldoc

DOMDocument to use for construction

inp

Input URL to use for construction

ref

Reference URL



PROCESSXSL Functions and Procedures

This function transforms input XMLDocument. Any changes to the default processor behavior should be effected before calling this procedure. An application error is raised if processing fails.

Syntax

Transforms input XMLDocument using given DOMDocument and stylesheet, and returns the resultant document fragment:

DBMS_XSLPROCESSOR.PROCESSXSL(
   p      IN   Processor,
   ss     IN   Stylesheet,
   xmldoc IN   DOMDOCUMENT), 
 RETURN DOMDOCUMENTFRAGMENT;

Transforms input XMLDocument using given document as URL and the Stylesheet, and returns the resultant document fragment:

DBMS_XSLPROCESSOR.PROCESSXSL(
   p     IN   Processor,
   ss    IN   Stylesheet,
   url   IN   VARCHAR2, 
 RETURN DOMDOCUMENTFRAGMENT;

Transforms input XMLDocument using given document as CLOB and the Stylesheet, and returns the resultant document fragment:

DBMS_XSLPROCESSOR.PROCESSXSL(
   p     IN   Processor,
   ss    IN  Stylesheet,
   clb   IN  CLOB)
 RETURN DOMDOCUMENTFRAGMENT;

Transforms input XMLDocument using given DOMDOCUMENT and the stylesheet, and writes the output to the specified file:

DBMS_XSLPROCESSOR.DBMS_XSLPROCESSOR.(
   p           IN    Processor,
   ss          IN    Stylesheet,
   xmldoc      IN    DOMDOCUMENT,
   dir         IN    VARCHAR2,
   fileName    IN    VARCHAR2);

Transforms input XMLDocument using given URL and the stylesheet, and writes the output to the specified file in a specified directory:

DBMS_XSLPROCESSOR.PROCESSXSL(
   p          IN    Processor,
   ss         IN    Stylesheet,
   url        IN    VARCHAR2,
   dir        IN    VARCHAR2,
   fileName   IN    VARCHAR2);

Transforms input XMLDocument using given DOMDOCUMENT and the stylesheet, and writes the output to a CLOB:

DBMS_XSLPROCESSOR.PROCESSXSL(
   p          IN      Processor,
   ss         IN      Stylesheet,
   xmldoc     IN      DOMDOCUMENT,
   cl         IN OUT  CLOB);

Transforms input XMLDocument using given DOMDOCUMENTFRAGMENT and the stylesheet, and returns the resultant document fragment:

DBMS_XSLPROCESSOR.PROCESSXSL(
   p         IN    Processor,
   ss        IN    Stylesheet,
   xmldf     IN    DOMDOCUMENTFRAGMENT)
 RETURN DOMDOCUMENTFRAGMENT;

Transforms input XMLDocumentFragment using given DOMDocumentFragment and the stylesheet, and writes the output to the specified file in a specified directory:

DBMS_XSLPROCESSOR.PROCESSXSL(
   p         IN    Processor,
   ss        IN    Stylesheet,
   xmldf     IN    DOMDOCUMENTFRAGMENT,
   dir       IN    VARCHAR2,
   filename  IN    VARCHAR2);

Transforms input XMLDocumentFragment using given DOMDOCUMENTFRAGMENT and the stylesheet, and writes the output to a buffer:

DBMS_XSLPROCESSOR.PROCESSXSL(
   p          IN       Processor,
   ss         IN       Stylesheet,
   xmldf      IN       DOMDOCUMENTFRAGMENT,
   buf        IN OUT   VARCHAR2);

Transforms input XMLDocumentFragment using given DOMDOCUMENTFRAGMENT and the stylesheet, and writes the output to a CLOB:

DBMS_XSLPROCESSOR.PROCESSXSL(
   p          IN      Processor,
   ss         IN      Stylesheet,
   xmldf      IN      DOMDOCUMENTFRAGMENT,
   cl         IN OUT  CLOB);

Parameters

Table 165-6 PROCESSXSL Function and Procedure Parameters

Parameter Description

p

Processor instance

ss

Stylesheet instance

xmldoc

XML document being transformed

url

URL for the information being transformed

clb

CLOB containing information to be transformed

dir

Directory where processing output file is saved

filename

Processing output file

cl

CLOB to which the processing output is saved

xmldf

XMLDocumentFragment being transformed



READ2CLOB Function

This function reads content of a file into a CLOB.

Syntax

DBMS_XSLPROCESSOR.READ2CLOB(
   flocation     IN   VARCHAR2,
   fname         IN   VARCHAR2,
   csid          IN   NUMBER:=0)
 RETURN CLOB;

Parameters

Table 165-7 READ2CLOB Function Parameters

Parameter Description

flocation

File directory

fname

File name

csid

Character set id of the file

  • Must be a valid Oracle id; otherwise returns an error

  • If 0, input file is assumed to be in the database character set



REMOVEPARAM Procedure

This procedure removes a top level stylesheet parameter.

Syntax

DBMS_XSLPROCESSOR.REMOVEPARAM(
   ss     IN  Stylesheet,
   name   IN  VARCHAR2);

Parameters

Table 165-8 REMOVEPARAM Procedure Parameters

Parameter Description

ss

Stylesheet instance

name

Name of the parameter



RESETPARAMS Procedure

This procedure resets the top-level stylesheet parameters.

Syntax

DBMS_XSLPROCESSOR.RESETPARAMS(
   ss  IN   Stylesheet);

Parameters

Table 165-9 RESETPARAMS Procedure Parameters

Parameter Description

ss

Stylesheet instance



SELECTNODES Function

This function selects nodes which match the suplied path expression from a DOM tree, and returns the result of the selection.

Syntax

DBMS_XSLPROCESSOR.SELECTNODES( 
   n           IN   DBMS_XMLDOM.DOMNODE,
   pattern     IN   VARCHAR2,
   namespace   IN VARCHAR2 := NULL)
 RETURN DBMS_XMLDOM.DOMNODELIST;

Parameters

Table 165-10 SELECTNODES Function Parameters

Parameter Description

n

Root DOMNode of the tree

pattern

Pattern to use

namespace

Namespace declared



SELECTSINGLENODE Function

This function selects the first node from the tree that match the suplied path expression, and returns that node.

Syntax

DBMS_XSLPROCESSOR.SELECTSINGLENODE(
   n           IN   DBMS_XMLDOM.DOMNODE,
   pattern     IN   VARCHAR2,
   namespace   IN VARCHAR2 := NULL)
 RETURN DBMS_XMLDOM.DOMNODE;

Parameters

Table 165-11

Parameter Description

n

Root DOMNode of the tree

pattern

Pattern to use

namespace

Namespace declared



SETERRORLOG Procedure

This procedure sets errors to be sent to the specified file.

Note:

This subprogram has been deprecated, and is included only for reasons of backward compatibility.

Syntax

DBMS_XSLPROCESSOR.SETERRORLOG(
   p         IN   Processor,
   fileName  IN   VARCHAR2);

Parameters

Table 165-12 SETERRORLOG Procedure Parameters

Parameter Description

p

Processor instance

fileName

Complete path of the file to use as the error log



SETPARAM Procedure

This procedure sets a top level parameter in the stylesheet. The parameter value must be a valid XPath expression. Literal string values must be quoted.

Syntax

DBMS_XSLPROCESSOR.SETPARAM(
   ss      IN   Stylesheet,
   name    IN   VARCHAR2,
   value   IN   VARCHAR2);

Parameters

Table 165-13 SETPARAM Procedure Parameters

Parameter Description

ss

Stylesheet instance

name

Name of the parameter

value

Value of the parameter



SHOWWARNINGS Procedure

This procedure turns warnings on (TRUE) or off (FALSE).

Syntax

DBMS_XSLPROCESSOR.SHOWWARNINGS(
   p     IN   Processor,
   yes   IN   BOOLEAN);

Parameters

Table 165-14 SHOWWARNINGS Procedure Parameters

Parameter Description

p

Processor instance

yes

Mode to set: TRUE to show warnings, FALSE otherwise



TRANSFORMNODE Function

This function transforms a node in a DOM tree using the given stylesheet, and returns the result of the transformation as a DOMDocumentFragment.

Syntax

DBMS_XSLPROCESSOR.TRANSFORMNODE(
   n    IN  DOMNODE,
   ss   IN  Stylesheet)
 RETURN DOMDocumentFragment;

Parameters

Table 165-15 TRANSFORMNODE Function Parameters

Parameter Description

n

DOMNode to transform

ss

Stylesheet to use



VALUEOF Function and Procedure

This subprogram retrieves the value of the first node from the tree that matches the given pattern. You can use either a function or a procedure.

Syntax

DBMS_XSLPROCESSOR.VALUEOF(
  n           IN    DBMS_XMLDOM.DOMNODE,
  pattern     IN    VARCHAR2,
  namespace   IN    VARCHAR2 := NULL)
 RETURN VARCHAR2;
DBMS_XSLPROCESSOR.VALUEOF(
  n           IN    DBMS_XMLDOM.DOMNODE,
  pattern     IN    VARCHAR2,
  val         OUT   VARCHAR2,
  namespace   IN    VARCHAR2 := NULL);

Parameters

Table 165-16 VALUEOF Function and Procedure Parameters

Parameter Description

n

Node whose value is being retrieved

pattern

Pattern to use

val

Retrieved value

namespace

Namespace to use