public Object convert(final TypeLiteral role, final String value) {
        if (value.trim().startsWith("<")) {
            try {
                final MXParser parser = new MXParser();
                parser.setInput(new StringReader(value));
                parser.nextTag();

                return parse(parser, role);
            } catch (final Exception e) {

   * fraction {@code sqrt(1/(R*R) - 1)} of the population standard deviation of {@code x}. This fit
   * does not normally minimize that error: to do that, you should swap the roles of {@code x} and
   * {@code y}.
   *
   * <h3>Non-finite values</h3>
   *
   * <p>If the dataset contains any non-finite values ({@link Double#POSITIVE_INFINITY}, {@link

Esto es muy útil cuando necesitas:

* Tener lógica compartida (la misma lógica de código una y otra vez).
* Compartir conexiones a bases de datos.
* Imponer seguridad, autenticación, requisitos de roles, etc.
* Y muchas otras cosas...

Todo esto, mientras minimizas la repetición de código.

## Primeros Pasos { #first-steps }

Veamos un ejemplo muy simple. Será tan simple que no es muy útil, por ahora.

func registerSTSRouter(router *mux.Router) {
	// Initialize STS.
	sts := &stsAPIHandlers{}

	// STS Router
	stsRouter := router.NewRoute().PathPrefix(SlashSeparator).Subrouter()

	// Assume roles with no JWT, handles AssumeRole.
	stsRouter.Methods(http.MethodPost).MatcherFunc(func(r *http.Request, rm *mux.RouteMatch) bool {
		ctypeOk := wildcard.MatchSimple("application/x-www-form-urlencoded*", r.Header.Get(xhttp.ContentType))

        assertEquals(
                "2.0.6",
                pom.getValue(
                        "build/plugins[1]/executions[1]/configuration[1]/rules[1]/requireMavenVersion[1]/version"));
        assertEquals(
                "[1.4,)",
                pom.getValue("build/plugins[1]/executions[1]/configuration[1]/rules[1]/requireJavaVersion[1]/version"));
    }

 * intermediate certificate, "Entrust Certification Authority - L1M". The intermediate certificate
 * is used to verify the signature of the "www.squareup.com" certificate.
 *
 * This roles are reversed for client authentication. In that case the client has a private key and
 * a chain of certificates. The server uses a set of trusted root certificates to authenticate the

                val = interpolate(org);
                if (org != val) {
                    contributor.setOrganizationUrl(val);
                }
                // Roles
                visit(contributor.getRoles());
            }
        }

        private void visit(MailingList mailingList) {
            if (mailingList != null) {
                String org, val;

#### **RBAC**

*   New permissions have been added to default RBAC roles ([#52654](https://github.com/kubernetes/kubernetes/pull/52654),[ @liggitt](https://github.com/liggitt)):
    *   The default admin and edit roles now include read/write permissions
    *   The view role includes read permissions on poddisruptionbudget.policy resources.

            dependency.

            The term "scope" comes from the OAuth2 specification, it seems to be
            intentionally vague and interpretable. It normally refers to permissions,
            in cases to roles.

            These scopes are integrated with OpenAPI (and the API docs at `/docs`).
            So they are visible in the OpenAPI specification.
            )
            """
        ),
    ] = None,

          <type>String</type>
        </field>
        <field>
          <name>roles</name>
          <version>3.0.0+</version>
          <description>
            The roles the contributor plays in the project. Each role is described by a
            {@code role} element, the body of which is a role name. This can also be used to
            describe the contribution.
          </description>