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/**
* Provides the interfaces for the Simple API for XML (SAX). Supports both
* the SAX1 and SAX2 APIs.
*
* <p>
* <h2> SAX2 Standard Feature Flags </h2>
*
* <p>
* One of the essential characteristics of SAX2 is that it added
* feature flags which can be used to examine and perhaps modify
* parser modes, in particular modes such as validation.
* Since features are identified by (absolute) URIs, anyone
* can define such features.
* Currently defined standard feature URIs have the prefix
* <code>http://xml.org/sax/features/</code> before an identifier such as
* <code>validation</code>. Turn features on or off using
* <em>setFeature</em>. Those standard identifiers are:
*
*
* <table class="striped">
* <caption>Standard Features</caption>
* <thead>
* <tr>
* <th scope="col">Feature ID</th>
* <th scope="col">Access</th>
* <th scope="col">Default</th>
* <th scope="col">Description</th>
* </tr>
* </thead>
*
* <tbody>
* <tr>
* <th scope="row">external-general-entities</th>
* <td><em>read/write</em></td>
* <td><em>unspecified</em></td>
* <td> Reports whether this parser processes external
* general entities; always true if validating.
* </td>
* </tr>
*
* <tr>
* <th scope="row">external-parameter-entities</th>
* <td><em>read/write</em></td>
* <td><em>unspecified</em></td>
* <td> Reports whether this parser processes external
* parameter entities; always true if validating.
* </td>
* </tr>
*
* <tr>
* <th scope="row">is-standalone</th>
* <td>(parsing) <em>read-only</em>, (not parsing) <em>none</em></td>
* <td>not applicable</td>
* <td> May be examined only during a parse, after the
* <em>startDocument()</em> callback has been completed; read-only.
* The value is true if the document specified standalone="yes" in
* its XML declaration, and otherwise is false.
* </td>
* </tr>
*
* <tr>
* <th scope="row">lexical-handler/parameter-entities</th>
* <td><em>read/write</em></td>
* <td><em>unspecified</em></td>
* <td> A value of "true" indicates that the LexicalHandler will report
* the beginning and end of parameter entities.
* </td>
* </tr>
*
* <tr>
* <th scope="row">namespaces</th>
* <td><em>read/write</em></td>
* <td>true</td>
* <td> A value of "true" indicates namespace URIs and unprefixed local names
* for element and attribute names will be available.
* </td>
* </tr>
*
* <tr>
* <th scope="row">namespace-prefixes</th>
* <td><em>read/write</em></td>
* <td>false</td>
* <td> A value of "true" indicates that XML qualified names (with prefixes) and
* attributes (including <em>xmlns*</em> attributes) will be available.
* </td>
* </tr>
*
* <tr>
* <th scope="row">resolve-dtd-uris</th>
* <td><em>read/write</em></td>
* <td><em>true</em></td>
* <td> A value of "true" indicates that system IDs in declarations will
* be absolutized (relative to their base URIs) before reporting.
* (That is the default behavior for all SAX2 XML parsers.)
* A value of "false" indicates those IDs will not be absolutized;
* parsers will provide the base URI from
* <em>Locator.getSystemId()</em>.
* This applies to system IDs passed in <ul>
* <li><em>DTDHandler.notationDecl()</em>,
* <li><em>DTDHandler.unparsedEntityDecl()</em>, and
* <li><em>DeclHandler.externalEntityDecl()</em>.
* </ul>
* It does not apply to <em>EntityResolver.resolveEntity()</em>,
* which is not used to report declarations, or to
* <em>LexicalHandler.startDTD()</em>, which already provides
* the non-absolutized URI.
* </td>
* </tr>
*
* <tr>
* <th scope="row">string-interning</th>
* <td><em>read/write</em></td>
* <td><em>unspecified</em></td>
* <td> Has a value of "true" if all XML names (for elements, prefixes,
* attributes, entities, notations, and local names),
* as well as Namespace URIs, will have been interned
* using <em>java.lang.String.intern</em>. This supports fast
* testing of equality/inequality against string constants,
* rather than forcing slower calls to <em>String.equals()</em>.
* </td>
* </tr>
*
* <tr>
* <th scope="row">unicode-normalization-checking</th>
* <td><em>read/write</em></td>
* <td><em>false</em></td>
* <td> Controls whether the parser reports Unicode normalization
* errors as described in section 2.13 and Appendix B of the
* XML 1.1 Recommendation. If true, Unicode normalization
* errors are reported using the ErrorHandler.error() callback.
* Such errors are not fatal in themselves (though, obviously,
* other Unicode-related encoding errors may be).
* </td>
* </tr>
*
* <tr>
* <th scope="row">use-attributes2</th>
* <td><em>read-only</em></td>
* <td>not applicable</td>
* <td> Returns "true" if the <em>Attributes</em> objects passed by
* this parser in <em>ContentHandler.startElement()</em>
* implement the <a href="ext/Attributes2.html"
* ><em>org.xml.sax.ext.Attributes2</em></a> interface.
* That interface exposes additional DTD-related information,
* such as whether the attribute was specified in the
* source text rather than defaulted.
* </td>
* </tr>
*
* <tr>
* <th scope="row">use-locator2</th>
* <td><em>read-only</em></td>
* <td>not applicable</td>
* <td> Returns "true" if the <em>Locator</em> objects passed by
* this parser in <em>ContentHandler.setDocumentLocator()</em>
* implement the <a href="ext/Locator2.html"
* ><em>org.xml.sax.ext.Locator2</em></a> interface.
* That interface exposes additional entity information,
* such as the character encoding and XML version used.
* </td>
* </tr>
*
* <tr>
* <th scope="row">use-entity-resolver2</th>
* <td><em>read/write</em></td>
* <td><em>true</em></td>
* <td> Returns "true" if, when <em>setEntityResolver</em> is given
* an object implementing the <a href="ext/EntityResolver2.html"
* ><em>org.xml.sax.ext.EntityResolver2</em></a> interface,
* those new methods will be used.
* Returns "false" to indicate that those methods will not be used.
* </td>
* </tr>
*
* <tr>
* <th scope="row">validation</th>
* <td><em>read/write</em></td>
* <td><em>unspecified</em></td>
* <td> Controls whether the parser is reporting all validity
* errors; if true, all external entities will be read.
* </td>
* </tr>
*
* <tr>
* <th scope="row">xmlns-uris</th>
* <td><em>read/write</em></td>
* <td><em>false</em></td>
* <td> Controls whether, when the <em>namespace-prefixes</em> feature
* is set, the parser treats namespace declaration attributes as
* being in the <em>http://www.w3.org/2000/xmlns/</em> namespace.
* By default, SAX2 conforms to the original "Namespaces in XML"
* Recommendation, which explicitly states that such attributes are
* not in any namespace.
* Setting this optional flag to "true" makes the SAX2 events conform to
* a later backwards-incompatible revision of that recommendation,
* placing those attributes in a namespace.
* </td>
* </tr>
*
* <tr>
* <th scope="row">xml-1.1</th>
* <td><em>read-only</em></td>
* <td>not applicable</td>
* <td> Returns "true" if the parser supports both XML 1.1 and XML 1.0.
* Returns "false" if the parser supports only XML 1.0.
* </td>
* </tr>
* </tbody>
* </table>
*
* <p>
* Support for the default values of the
* <em>namespaces</em> and <em>namespace-prefixes</em>
* properties is required.
* Support for any other feature flags is entirely optional.
*
*
* <p>
* For default values not specified by SAX2,
* each XMLReader implementation specifies its default,
* or may choose not to expose the feature flag.
* Unless otherwise specified here,
* implementations may support changing current values
* of these standard feature flags, but not while parsing.
*
*
* <h2> SAX2 Standard Handler and Property IDs </h2>
*
* <p>
* For parser interface characteristics that are described
* as objects, a separate namespace is defined. The
* objects in this namespace are again identified by URI, and
* the standard property URIs have the prefix
* <code>http://xml.org/sax/properties/</code> before an identifier such as
* <code>lexical-handler</code> or
* <code>dom-node</code>. Manage those properties using
* <em>setProperty()</em>. Those identifiers are:
*
* <table class="striped">
* <caption>Standard Property IDs</caption>
* <thead>
* <tr>
* <th scope="col">Property ID</th>
* <th scope="col">Description</th>
* </tr>
* </thead>
*
* <tbody>
* <tr>
* <th scope="row">declaration-handler</th>
* <td> Used to see most DTD declarations except those treated
* as lexical ("document element name is ...") or which are
* mandatory for all SAX parsers (<em>DTDHandler</em>).
* The Object must implement <a href="ext/DeclHandler.html"
* ><em>org.xml.sax.ext.DeclHandler</em></a>.
* </td>
* </tr>
*
* <tr>
* <th scope="row">document-xml-version</th>
* <td> May be examined only during a parse, after the startDocument()
* callback has been completed; read-only. This property is a
* literal string describing the actual XML version of the document,
* such as "1.0" or "1.1".
* </td>
* </tr>
*
* <tr>
* <th scope="row">dom-node</th>
* <td> For "DOM Walker" style parsers, which ignore their
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