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Copyright (c) 2009, 2020 Oracle and/or its affiliates. All rights reserved.
This program and the accompanying materials are made available under the
terms of the Eclipse Public License v. 2.0, which is available at
http://www.eclipse.org/legal/epl-2.0.
This Source Code may also be made available under the following Secondary
Licenses when the conditions for such availability set forth in the
Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
version 2 with the GNU Classpath Exception, which is available at
https://www.gnu.org/software/classpath/license.html.
SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
...
The instance documents may indicate the published
version of the schema using xsi:schemaLocation attribute
for Jakarta EE namespace with the following location:
https://jakarta.ee/xml/ns/jakartaee/web-jsptaglibrary_3_0.xsd
]]>
The taglib tag is the document root.
The definition of taglib is provided
by the tldTaglibType.
The taglib element contains, among other things, tag and
tag-file elements.
The name subelements of these elements must each be unique.
The taglib element contains function elements.
The name subelements of these elements must each be unique.
Specifies the type of body that is valid for a tag.
This value is used by the JSP container to validate
that a tag invocation has the correct body syntax and
by page composition tools to assist the page author
in providing a valid tag body.
There are currently four values specified:
tagdependent The body of the tag is interpreted by the tag
implementation itself, and is most likely
in a different "language", e.g embedded SQL
statements.
JSP The body of the tag contains nested JSP
syntax.
empty The body must be empty
scriptless The body accepts only template text, EL
Expressions, and JSP action elements. No
scripting elements are allowed.
Defines the canonical name of a tag or attribute being
defined.
The name must conform to the lexical rules for an NMTOKEN.
A validator that can be used to validate
the conformance of a JSP page to using this tag library is
defined by a validatorType.
Defines the TagLibraryValidator class that can be used
to validate the conformance of a JSP page to using this
tag library.
The init-param element contains a name/value pair as an
initialization param.
The tag defines a unique tag in this tag library. It has one
attribute, id.
The tag element may have several subelements defining:
description Optional tag-specific information
display-name A short name that is intended to be
displayed by tools
icon Optional icon element that can be used
by tools
name The unique action name
tag-class The tag handler class implementing
jakarta.servlet.jsp.tagext.JspTag
tei-class An optional subclass of
jakarta.servlet.jsp.tagext.TagExtraInfo
body-content The body content type
variable Optional scripting variable information
attribute All attributes of this action that are
evaluated prior to invocation.
dynamic-attributes Whether this tag supports additional
attributes with dynamic names. If
true, the tag-class must implement the
jakarta.servlet.jsp.tagext.DynamicAttributes
interface. Defaults to false.
example Optional informal description of an
example of a use of this tag
tag-extension Zero or more extensions that provide extra
information about this tag, for tool
consumption
Defines the subclass of jakarta.serlvet.jsp.tagext.JspTag
that implements the request time semantics for
this tag. (required)
Defines the subclass of jakarta.servlet.jsp.tagext.TagExtraInfo
for this tag. (optional)
If this is not given, the class is not consulted at
translation time.
Specifies the format for the body of this tag.
The default in JSP 1.2 was "JSP" but because this
is an invalid setting for simple tag handlers, there
is no longer a default in JSP 2.0. A reasonable
default for simple tag handlers is "scriptless" if
the tag can have a body.
The example element contains an informal description
of an example of the use of a tag.
Tag extensions are for tool use only and must not affect
the behavior of a container.
Defines an action in this tag library that is implemented
as a .tag file.
The tag-file element has two required subelements:
description Optional tag-specific information
display-name A short name that is intended to be
displayed by tools
icon Optional icon element that can be used
by tools
name The unique action name
path Where to find the .tag file implementing this
action, relative to the root of the web
application or the root of the JAR file for a
tag library packaged in a JAR. This must
begin with /WEB-INF/tags if the .tag file
resides in the WAR, or /META-INF/tags if the
.tag file resides in a JAR.
example Optional informal description of an
example of a use of this tag
tag-extension Zero or more extensions that provide extra
information about this tag, for tool
consumption
The example element contains an informal description
of an example of the use of a tag.
Tag extensions are for tool use only and must not affect
the behavior of a container.
The function element is used to provide information on each
function in the tag library that is to be exposed to the EL.
The function element may have several subelements defining:
description Optional tag-specific information
display-name A short name that is intended to be
displayed by tools
icon Optional icon element that can be used
by tools
name A unique name for this function
function-class Provides the name of the Java class that
implements the function
function-signature Provides the signature, as in the Java
Language Specification, of the Java
method that is to be used to implement
the function.
example Optional informal description of an
example of a use of this function
function-extension Zero or more extensions that provide extra
information about this function, for tool
consumption
A unique name for this function.
Provides the fully-qualified class name of the Java
class containing the static method that implements
the function.
Provides the signature, of the static Java method that is
to be used to implement the function. The syntax of the
function-signature element is as follows:
FunctionSignature ::= ReturnType S MethodName S?
'(' S? Parameters? S? ')'
ReturnType ::= Type
MethodName ::= Identifier
Parameters ::= Parameter
| ( Parameter S? ',' S? Parameters )
Parameter ::= Type
Where:
* Type is a basic type or a fully qualified
Java class name (including package name),
as per the 'Type' production in the Java
Language Specification, Second Edition,
Chapter 18.
* Identifier is a Java identifier, as per
the 'Identifier' production in the Java
Language Specification, Second
Edition, Chapter 18.
Example:
java.lang.String nickName( java.lang.String, int )
The example element contains an informal description
of an example of the use of this function.
Function extensions are for tool use only and must not
affect the behavior of a container.
The taglib tag is the document root, it defines:
description a simple string describing the "use" of this
taglib, should be user discernable
display-name the display-name element contains a
short name that is intended to be displayed
by tools
icon optional icon that can be used by tools
tlib-version the version of the tag library implementation
short-name a simple default short name that could be
used by a JSP authoring tool to create
names with a mnemonic value; for example,
the it may be used as the prefered prefix
value in taglib directives
uri a uri uniquely identifying this taglib
validator optional TagLibraryValidator information
listener optional event listener specification
tag tags in this tag library
tag-file tag files in this tag library
function zero or more EL functions defined in this
tag library
taglib-extension zero or more extensions that provide extra
information about this taglib, for tool
consumption
Describes this version (number) of the taglibrary.
It is described as a dewey decimal.
Defines a simple default name that could be used by
a JSP authoring tool to create names with a
mnemonicvalue; for example, it may be used as the
preferred prefix value in taglib directives. Do
not use white space, and do not start with digits
or underscore.
Defines a public URI that uniquely identifies this
version of the taglibrary. Leave it empty if it
does not apply.
Taglib extensions are for tool use only and must not
affect the behavior of a container.
Describes the JSP version (number) this taglibrary
requires in order to function (dewey decimal)
The variableType provides information on the scripting
variables defined by using this tag. It is a (translation
time) error for a tag that has one or more variable
subelements to have a TagExtraInfo class that returns a
non-null value from a call to getVariableInfo().
The subelements of variableType are of the form:
description Optional description of this
variable
name-given The variable name as a constant
name-from-attribute The name of an attribute whose
(translation time) value will
give the name of the
variable. One of name-given or
name-from-attribute is required.
variable-class Name of the class of the variable.
java.lang.String is default.
declare Whether the variable is declared
or not. True is the default.
scope The scope of the scripting varaible
defined. NESTED is default.
The name for the scripting variable.
The name of an attribute whose
(translation-time) value will give the name of
the variable.
The optional name of the class for the scripting
variable. The default is java.lang.String.
Whether the scripting variable is to be defined
or not. See TagExtraInfo for details. This
element is optional and "true" is the default.
The element is optional and "NESTED" is the default.
This type defines scope of the scripting variable. See
TagExtraInfo for details. The allowed values are,
"NESTED", "AT_BEGIN" and "AT_END".
The attribute element defines an attribute for the nesting
tag. The attribute element may have several subelements
defining:
description a description of the attribute
name the name of the attribute
required whether the attribute is required or
optional
rtexprvalue whether the attribute is a runtime attribute
type the type of the attributes
fragment whether this attribute is a fragment
deferred-value present if this attribute is to be parsed as a
jakarta.el.ValueExpression
deferred-method present if this attribute is to be parsed as a
jakarta.el.MethodExpression
Defines if the nesting attribute is required or
optional.
If not present then the default is "false", i.e
the attribute is optional.
Defines if the nesting attribute can have scriptlet
expressions as a value, i.e the value of the
attribute may be dynamically calculated at request
time, as opposed to a static value determined at
translation time.
If not present then the default is "false", i.e the
attribute has a static value
Defines the Java type of the attributes value.
If this element is omitted, the expected type is
assumed to be "java.lang.Object".
Present if the value for this attribute is to be
passed to the tag handler as a
jakarta.el.ValueExpression. This allows for deferred
evaluation of EL expressions. An optional subelement
will contain the expected type that the value will
be coerced to after evaluation of the expression.
The type defaults to Object if one is not provided.
Present if the value for this attribute is to be
passed to the tag handler as a
jakarta.el.MethodExpression. This allows for deferred
evaluation of an EL expression that identifies a
method to be invoked on an Object. An optional
subelement will contain the expected method
signature. The signature defaults to "void method()"
if one is not provided.
"true" if this attribute is of type
jakarta.servlet.jsp.tagext.JspFragment, representing dynamic
content that can be re-evaluated as many times
as needed by the tag handler. If omitted or "false",
the default is still type="java.lang.String"
Defines information about how to provide the value for a
tag handler attribute that accepts a jakarta.el.ValueExpression.
The deferred-value element has one optional subelement:
type the expected type of the attribute
The fully-qualified name of the Java type that is the
expected type for this deferred expression. If this
element is omitted, the expected type is assumed to be
"java.lang.Object".
Defines information about how to provide the value for a
tag handler attribute that accepts a jakarta.el.MethodExpression.
The deferred-method element has one optional subelement:
method-signature Provides the signature, as in the Java
Language Specifies, that is expected for
the method being identified by the
expression.
Provides the expected signature of the method identified
by the jakarta.el.MethodExpression.
This disambiguates overloaded methods and ensures that
the return value is of the expected type.
The syntax of the method-signature element is identical
to that of the function-signature element. See the
documentation for function-signature for more details.
The name of the method is for documentation purposes only
and is ignored by the JSP container.
Example:
boolean validate(java.lang.String)
The tld-extensionType is used to indicate
extensions to a specific TLD element.
It is used by elements to designate an extension block
that is targeted to a specific extension designated by
a set of extension elements that are declared by a
namespace. The namespace identifies the extension to
the tool that processes the extension.
The type of the extension-element is abstract. Therefore,
a concrete type must be specified by the TLD using
xsi:type attribute for each extension-element.
The extensibleType is an abstract base type that is used to
define the type of extension-elements. Instance documents
must substitute a known type to define the extension by
using xsi:type attribute to define the actual type of
extension-elements.
