# Class OutputKeys

java.lang.Object
javax.xml.transform.OutputKeys

public class OutputKeys extends Object
Provides string constants that can be used to set output properties for a Transformer, or to retrieve output properties from a Transformer or Templates object.

All the fields in this class are read-only.

Since:
  1.4
See Also:
  - section 16 of the XSL Transformations (XSLT) W3C Recommendation

- ## Field Summary

  Fields
  Modifier and Type
  Field
  Description
  `static final String`
  `CDATA_SECTION_ELEMENTS`
  cdata-section-elements = expanded names.
  `static final String`
  `DOCTYPE_PUBLIC`
  doctype-public = string.
  `static final String`
  `DOCTYPE_SYSTEM`
  doctype-system = string.
  `static final String`
  `ENCODING`
  encoding = string.
  `static final String`
  `INDENT`
  indent = "yes" | "no".
  `static final String`
  `MEDIA_TYPE`
  media-type = string.
  `static final String`
  `METHOD`
  method = "xml" | "html" | "text" | expanded name.
  `static final String`
  `OMIT_XML_DECLARATION`
  omit-xml-declaration = "yes" | "no".
  `static final String`
  `STANDALONE`
  standalone = "yes" | "no".
  `static final String`
  `VERSION`
  version = nmtoken.

- ## Method Summary

  ### Methods declared in class Object

  `clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

- ## Field Details

  - ### METHOD

    public static final String METHOD
    method = "xml" | "html" | "text" | expanded name.

    The value of the method property identifies the overall method that should be used for outputting the result tree. Other non-namespaced values may be used, such as "xhtml", but, if accepted, the handling of such values is implementation defined. If any of the method values are not accepted and are not namespace qualified, then `Transformer.setOutputProperty(String, String)` or `Transformer.setOutputProperties(Properties)` will throw a `IllegalArgumentException`.

    See Also:
      - section 16 of the XSL Transformations (XSLT) W3C Recommendation
      - Constant Field Values

  - ### VERSION

    public static final String VERSION
    version = nmtoken.

    `version` specifies the version of the output method.

    When the output method is "xml", the version value specifies the version of XML to be used for outputting the result tree. The default value for the xml output method is 1.0. When the output method is "html", the version value indicates the version of the HTML. The default value for the xml output method is 4.0, which specifies that the result should be output as HTML conforming to the HTML 4.0 Recommendation [HTML]. If the output method is "text", the version property is ignored.

    See Also:
      - section 16 of the XSL Transformations (XSLT) W3C Recommendation
      - Constant Field Values

  - ### ENCODING

    public static final String ENCODING
    encoding = string.

    `encoding` specifies the preferred character encoding that the Transformer should use to encode sequences of characters as sequences of bytes. The value of the encoding property should be treated case-insensitively. The value must only contain characters in the range #x21 to #x7E (i.e., printable ASCII characters). The value should either be a `charset` registered with the Internet Assigned Numbers Authority [IANA], [RFC2278] or start with `X-`.

    See Also:
      - section 16 of the XSL Transformations (XSLT) W3C Recommendation
      - Constant Field Values

  - ### OMIT_XML_DECLARATION

    public static final String OMIT_XML_DECLARATION
    omit-xml-declaration = "yes" | "no".

    `omit-xml-declaration` specifies whether the XSLT processor should output an XML declaration; the value must be `yes` or `no`.

    See Also:
      - section 16 of the XSL Transformations (XSLT) W3C Recommendation
      - Constant Field Values

  - ### STANDALONE

    public static final String STANDALONE
    standalone = "yes" | "no".

    `standalone` specifies whether the Transformer should output a standalone document declaration; the value must be `yes` or `no`.

    See Also:
      - section 16 of the XSL Transformations (XSLT) W3C Recommendation
      - Constant Field Values

  - ### DOCTYPE_PUBLIC

    public static final String DOCTYPE_PUBLIC
    doctype-public = string.

    See the documentation for the `DOCTYPE_SYSTEM` property for a description of what the value of the key should be.

    See Also:
      - section 16 of the XSL Transformations (XSLT) W3C Recommendation
      - Constant Field Values

  - ### DOCTYPE_SYSTEM

    public static final String DOCTYPE_SYSTEM
    doctype-system = string.

    `doctype-system` specifies the system identifier to be used in the document type declaration.

    If the doctype-system property is specified, the xml output method should output a document type declaration immediately before the first element. The name following <!DOCTYPE should be the name of the first element. If doctype-public property is also specified, then the xml output method should output PUBLIC followed by the public identifier and then the system identifier; otherwise, it should output SYSTEM followed by the system identifier. The internal subset should be empty. The value of the doctype-public property should be ignored unless the doctype-system property is specified.

    If the doctype-public or doctype-system properties are specified, then the html output method should output a document type declaration immediately before the first element. The name following <!DOCTYPE should be HTML or html. If the doctype-public property is specified, then the output method should output PUBLIC followed by the specified public identifier; if the doctype-system property is also specified, it should also output the specified system identifier following the public identifier. If the doctype-system property is specified but the doctype-public property is not specified, then the output method should output SYSTEM followed by the specified system identifier.

    `doctype-system` specifies the system identifier to be used in the document type declaration.

    See Also:
      - section 16 of the XSL Transformations (XSLT) W3C Recommendation
      - Constant Field Values

  - ### CDATA_SECTION_ELEMENTS

    public static final String CDATA_SECTION_ELEMENTS
    cdata-section-elements = expanded names.

    `cdata-section-elements` specifies a whitespace delimited list of the names of elements whose text node children should be output using CDATA sections. Note that these names must use the format described in the section Qualified Name Representation in `javax.xml.transform`.

    See Also:
      - section 16 of the XSL Transformations (XSLT) W3C Recommendation.
      - Constant Field Values

  - ### INDENT

    public static final String INDENT
    indent = "yes" | "no".

    `indent` specifies whether the Transformer may add additional whitespace when outputting the result tree; the value must be `yes` or `no`.

    See Also:
      - section 16 of the XSL Transformations (XSLT) W3C Recommendation
      - Constant Field Values

  - ### MEDIA_TYPE

    public static final String MEDIA_TYPE
    media-type = string.

    `media-type` specifies the media type (MIME content type) of the data that results from outputting the result tree. The `charset` parameter should not be specified explicitly; instead, when the top-level media type is `text`, a `charset` parameter should be added according to the character encoding actually used by the output method.

    See Also:
      - s ection 16 of the XSL Transformations (XSLT) W3C Recommendation
      - Constant Field Values