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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.opendaylight.netconf.shaded.xerces.impl;

import java.util.Enumeration;
import java.util.NoSuchElementException;

/**
 * Commonly used constants.
 * 
 * @xerces.internal
 *
 * @author Andy Clark, IBM
 *
 * @version $Id: Constants.java 1400688 2012-10-21 17:59:34Z mrglavas $
 */
public final class Constants {
    
    //
    // Constants
    //
    // Schema Types:
    public static final String NS_XMLSCHEMA = "http://www.w3.org/2001/XMLSchema".intern();
    public static final String NS_DTD = "http://www.w3.org/TR/REC-xml".intern();
    
    // Schema Versions:
    public static final String W3C_XML_SCHEMA10_NS_URI = "http://www.w3.org/XML/XMLSchema/v1.0".intern();
    
    // sax features
    
    /** SAX feature prefix ("http://xml.org/sax/features/"). */
    public static final String SAX_FEATURE_PREFIX = "http://xml.org/sax/features/";
    
    /** Namespaces feature ("namespaces"). */
    public static final String NAMESPACES_FEATURE = "namespaces";
    
    /** Namespace prefixes feature ("namespace-prefixes"). */
    public static final String NAMESPACE_PREFIXES_FEATURE = "namespace-prefixes";
    
    /** String interning feature ("string-interning"). */
    public static final String STRING_INTERNING_FEATURE = "string-interning";
    
    /** Validation feature ("validation"). */
    public static final String VALIDATION_FEATURE = "validation";
    
    /** External general entities feature ("external-general-entities "). */
    public static final String EXTERNAL_GENERAL_ENTITIES_FEATURE = "external-general-entities";
    
    /** External parameter entities feature ("external-parameter-entities "). */
    public static final String EXTERNAL_PARAMETER_ENTITIES_FEATURE = "external-parameter-entities";
    
    /** Lexical handler parameter entities feature ("lexical-handler/parameter-entities"). */
    public static final String LEXICAL_HANDLER_PARAMETER_ENTITIES_FEATURE = "lexical-handler/parameter-entities";
    
    /** Is standalone feature ("is-standalone"). */
    public static final String IS_STANDALONE_FEATURE = "is-standalone";
    
    /** Resolve DTD URIs feature ("resolve-dtd-uris"). */
    public static final String RESOLVE_DTD_URIS_FEATURE = "resolve-dtd-uris";
    
    /** Use Attributes2 feature ("use-attributes2"). */
    public static final String USE_ATTRIBUTES2_FEATURE = "use-attributes2";
    
    /** Use Locator2 feature ("use-locator2"). */
    public static final String USE_LOCATOR2_FEATURE = "use-locator2";
    
    /** Use EntityResolver2 feature ("use-entity-resolver2"). */
    public static final String USE_ENTITY_RESOLVER2_FEATURE = "use-entity-resolver2";
    
    /** Unicode normalization checking feature ("unicode-normalization-checking"). */
    public static final String UNICODE_NORMALIZATION_CHECKING_FEATURE = "unicode-normalization-checking";
    
    /** xmlns URIs feature ("xmlns-uris"). */
    public static final String XMLNS_URIS_FEATURE = "xmlns-uris";
    
    /** XML 1.1 feature ("xml-1.1"). */
    public static final String XML_11_FEATURE = "xml-1.1";
    
    /** Allow unparsed entity and notation declaration events to be sent after the end DTD event ("allow-dtd-events-after-endDTD") */
    public static final String ALLOW_DTD_EVENTS_AFTER_ENDDTD_FEATURE = "allow-dtd-events-after-endDTD";
    
    // sax properties
    
    /** SAX property prefix ("http://xml.org/sax/properties/"). */
    public static final String SAX_PROPERTY_PREFIX = "http://xml.org/sax/properties/";
    
    /** Declaration handler property ("declaration-handler"). */
    public static final String DECLARATION_HANDLER_PROPERTY = "declaration-handler";
    
    /** Lexical handler property ("lexical-handler"). */
    public static final String LEXICAL_HANDLER_PROPERTY = "lexical-handler";
    
    /** DOM node property ("dom-node"). */
    public static final String DOM_NODE_PROPERTY = "dom-node";
    
    /** XML string property ("xml-string"). */
    public static final String XML_STRING_PROPERTY = "xml-string";
    
    /** Document XML version property ("document-xml-version"). */
    public static final String DOCUMENT_XML_VERSION_PROPERTY = "document-xml-version";
    
    
    //
    // JAXP properties
    //
    
    /** JAXP property prefix ("http://java.sun.com/xml/jaxp/properties/"). */
    public static final String JAXP_PROPERTY_PREFIX =
        "http://java.sun.com/xml/jaxp/properties/";
    
    /** JAXP schemaSource property: when used internally may include DTD sources (DOM) */
    public static final String SCHEMA_SOURCE = "schemaSource";
    
    /** JAXP schemaSource language: when used internally may include DTD namespace (DOM) */
    public static final String SCHEMA_LANGUAGE = "schemaLanguage";
    
    
    //
    // DOM features
    //
    
    /** Comments feature ("include-comments"). */
    public static final String INCLUDE_COMMENTS_FEATURE = "include-comments";
    
    /** Create cdata nodes feature ("create-cdata-nodes"). */
    public static final String CREATE_CDATA_NODES_FEATURE = "create-cdata-nodes";
    
    /** Feature id: load as infoset. */
    public static final String LOAD_AS_INFOSET = "load-as-infoset";
    
    
    //
    // Constants: DOM Level 3 feature ids
    //
    
    public static final String DOM_CANONICAL_FORM = "canonical-form";
    public static final String DOM_CDATA_SECTIONS ="cdata-sections";
    public static final String DOM_COMMENTS = "comments"; 
    
    // REVISIT: this feature seems to have no effect for Xerces
    public static final String DOM_CHARSET_OVERRIDES_XML_ENCODING = 
        "charset-overrides-xml-encoding"; 
    
    public static final String DOM_DATATYPE_NORMALIZATION = "datatype-normalization"; 
    public static final String DOM_ENTITIES = "entities";
    public static final String DOM_INFOSET = "infoset";  
    public static final String DOM_NAMESPACES = "namespaces";
    public static final String DOM_NAMESPACE_DECLARATIONS = "namespace-declarations";
    public static final String DOM_SUPPORTED_MEDIATYPES_ONLY =
        "supported-media-types-only";
    
    public static final String DOM_VALIDATE_IF_SCHEMA = "validate-if-schema";
    public static final String DOM_VALIDATE = "validate";
    public static final String DOM_ELEMENT_CONTENT_WHITESPACE =
        "element-content-whitespace";
    
    // DOM Level 3 features defined in Core:
    public static final String DOM_DISCARD_DEFAULT_CONTENT = "discard-default-content";
    public static final String DOM_NORMALIZE_CHARACTERS    = "normalize-characters";
    public static final String DOM_CHECK_CHAR_NORMALIZATION  = "check-character-normalization";
    public static final String DOM_WELLFORMED  = "well-formed";
    public static final String DOM_SPLIT_CDATA = "split-cdata-sections";
    
    // Load and Save
    public static final String DOM_FORMAT_PRETTY_PRINT = "format-pretty-print";
    public static final String DOM_XMLDECL = "xml-declaration";
    public static final String DOM_UNKNOWNCHARS = "unknown-characters";
    public static final String DOM_CERTIFIED =  "certified";
    public static final String DOM_DISALLOW_DOCTYPE =  "disallow-doctype";
    public static final String DOM_IGNORE_UNKNOWN_CHARACTER_DENORMALIZATIONS =  "ignore-unknown-character-denormalizations";
    
    // DOM Properties
    public static final String DOM_RESOURCE_RESOLVER = "resource-resolver";
    public static final String DOM_ERROR_HANDLER = "error-handler";
    public static final String DOM_SCHEMA_TYPE = "schema-type";
    public static final String DOM_SCHEMA_LOCATION = "schema-location";
    
    // XSModel
    public static final String DOM_PSVI = "psvi";
    
    
    // xerces features
    
    /** Xerces features prefix ("http://apache.org/xml/features/"). */
    public static final String XERCES_FEATURE_PREFIX = "http://apache.org/xml/features/";
    
    /** Schema validation feature ("validation/schema"). */
    public static final String SCHEMA_VALIDATION_FEATURE = "validation/schema";
    
    /** Expose schema normalized values */
    public static final String SCHEMA_NORMALIZED_VALUE = "validation/schema/normalized-value";
    
    /** Send schema default value via characters() */
    public static final String SCHEMA_ELEMENT_DEFAULT = "validation/schema/element-default";
    
    /** Schema full constraint checking ("validation/schema-full-checking"). */
    public static final String SCHEMA_FULL_CHECKING = "validation/schema-full-checking";
    
    /** Augment Post-Schema-Validation-Infoset */
    public static final String SCHEMA_AUGMENT_PSVI = "validation/schema/augment-psvi";
    
    /** Dynamic validation feature ("validation/dynamic"). */
    public static final String DYNAMIC_VALIDATION_FEATURE = "validation/dynamic";
    
    /** Warn on duplicate attribute declaration feature ("validation/warn-on-duplicate-attdef"). */
    public static final String WARN_ON_DUPLICATE_ATTDEF_FEATURE = "validation/warn-on-duplicate-attdef";
    
    /** Warn on undeclared element feature ("validation/warn-on-undeclared-elemdef"). */
    public static final String WARN_ON_UNDECLARED_ELEMDEF_FEATURE = "validation/warn-on-undeclared-elemdef";
    
    /** Warn on duplicate entity declaration feature ("warn-on-duplicate-entitydef"). */
    public static final String WARN_ON_DUPLICATE_ENTITYDEF_FEATURE = "warn-on-duplicate-entitydef";
    
    /** Allow Java encoding names feature ("allow-java-encodings"). */
    public static final String ALLOW_JAVA_ENCODINGS_FEATURE = "allow-java-encodings";
    
    /** Disallow DOCTYPE declaration feature ("disallow-doctype-decl"). */
    public static final String DISALLOW_DOCTYPE_DECL_FEATURE = "disallow-doctype-decl";
    
    /** Continue after fatal error feature ("continue-after-fatal-error"). */
    public static final String CONTINUE_AFTER_FATAL_ERROR_FEATURE = "continue-after-fatal-error";
    
    /** Load dtd grammar when nonvalidating feature ("nonvalidating/load-dtd-grammar"). */
    public static final String LOAD_DTD_GRAMMAR_FEATURE = "nonvalidating/load-dtd-grammar";
    
    /** Load external dtd when nonvalidating feature ("nonvalidating/load-external-dtd"). */
    public static final String LOAD_EXTERNAL_DTD_FEATURE = "nonvalidating/load-external-dtd";
    
    /** Defer node expansion feature ("dom/defer-node-expansion"). */
    public static final String DEFER_NODE_EXPANSION_FEATURE = "dom/defer-node-expansion";
    
    /** Create entity reference nodes feature ("dom/create-entity-ref-nodes"). */
    public static final String CREATE_ENTITY_REF_NODES_FEATURE = "dom/create-entity-ref-nodes";
    
    /** Include ignorable whitespace feature ("dom/include-ignorable-whitespace"). */
    public static final String INCLUDE_IGNORABLE_WHITESPACE = "dom/include-ignorable-whitespace";
    
    /** Default attribute values feature ("validation/default-attribute-values"). */
    public static final String DEFAULT_ATTRIBUTE_VALUES_FEATURE = "validation/default-attribute-values";
    
    /** Validate content models feature ("validation/validate-content-models"). */
    public static final String VALIDATE_CONTENT_MODELS_FEATURE = "validation/validate-content-models";
    
    /** Validate datatypes feature ("validation/validate-datatypes"). */
    public static final String VALIDATE_DATATYPES_FEATURE = "validation/validate-datatypes";
    
    /** Balance syntax trees feature ("validation/balance-syntax-trees"). */
    public static final String BALANCE_SYNTAX_TREES = "validation/balance-syntax-trees";
    
    /** Notify character references feature (scanner/notify-char-refs"). */
    public static final String NOTIFY_CHAR_REFS_FEATURE = "scanner/notify-char-refs";
    
    /** Notify built-in (&, etc.) references feature (scanner/notify-builtin-refs"). */
    public static final String NOTIFY_BUILTIN_REFS_FEATURE = "scanner/notify-builtin-refs";
    
    /** Standard URI conformant feature ("standard-uri-conformant"). */
    public static final String STANDARD_URI_CONFORMANT_FEATURE = "standard-uri-conformant";
    
    /** Generate synthetic annotations feature ("generate-synthetic-annotations"). */
    public static final String GENERATE_SYNTHETIC_ANNOTATIONS_FEATURE = "generate-synthetic-annotations";
    
    /** Validate annotations feature ("validate-annotations"). */
    public static final String VALIDATE_ANNOTATIONS_FEATURE = "validate-annotations";
    
    /** Honour all schemaLocations feature ("honour-all-schemaLocations"). */
    public static final String HONOUR_ALL_SCHEMALOCATIONS_FEATURE = "honour-all-schemaLocations";
    
    /** Namespace growth feature ("namespace-growth"). */
    public static final String NAMESPACE_GROWTH_FEATURE = "namespace-growth";

    /** Tolerate duplicates feature ("internal/tolerate-duplicates"). */
    public static final String TOLERATE_DUPLICATES_FEATURE = "internal/tolerate-duplicates";
    
    /** String interned feature ("internal/strings-interned"). */
    public static final String STRINGS_INTERNED_FEATURE = "internal/strings-interned";
    
    /** XInclude processing feature ("xinclude"). */
    public static final String XINCLUDE_FEATURE = "xinclude";
    
    /** XInclude fixup base URIs feature ("xinclude/fixup-base-uris"). */
    public static final String XINCLUDE_FIXUP_BASE_URIS_FEATURE = "xinclude/fixup-base-uris";
    
    /** XInclude fixup language feature ("xinclude/fixup-language"). */
    public static final String XINCLUDE_FIXUP_LANGUAGE_FEATURE = "xinclude/fixup-language";    
    
    /**
     * Feature to ignore xsi:type attributes on elements during validation,
     * until a global element declaration is found. ("validation/schema/ignore-xsi-type-until-elemdecl")
     * If this feature is on when validating a document, then beginning at the validation root
     * element, xsi:type attributes are ignored until a global element declaration is
     * found for an element.  Once a global element declaration has been found, xsi:type
     * attributes will start being processed for the sub-tree beginning at the element for
     * which the declaration was found.
     * 
     * Suppose an element A has two element children, B and C.
     * 
     * If a global element declaration is found for A, xsi:type attributes on A, B and C,
     * and all of B and C's descendents, will be processed.
     * 
     * If no global element declaration is found for A or B, but one is found for C,
     * then xsi:type attributes will be ignored on A and B (and any descendents of B,
     * until a global element declaration is found), but xsi:type attributes will be
     * processed for C and all of C's descendents.
     * 
     * Once xsi:type attributes stop being ignored for a subtree, they do not start
     * being ignored again, even if more elements are encountered for which no global
     * element declaration can be found.
     */
    public static final String IGNORE_XSI_TYPE_FEATURE = "validation/schema/ignore-xsi-type-until-elemdecl";
    
    /** Perform checking of ID/IDREFs ("validation/id-idref-checking") */
    public static final String ID_IDREF_CHECKING_FEATURE = "validation/id-idref-checking";
    
    /** Feature to ignore errors caused by identity constraints ("validation/identity-constraint-checking") */
    public static final String IDC_CHECKING_FEATURE = "validation/identity-constraint-checking";
    
    /** Feature to ignore errors caused by unparsed entities ("validation/unparsed-entity-checking") */
    public static final String UNPARSED_ENTITY_CHECKING_FEATURE = "validation/unparsed-entity-checking";
    
    /**
     * Internal feature. When set to true the schema validator will only use
     * schema components from the grammar pool provided.
     */
    public static final String USE_GRAMMAR_POOL_ONLY_FEATURE = "internal/validation/schema/use-grammar-pool-only";
    
    /** Internal performance related feature: 
     * false - the parser settings (features/properties) have not changed between 2 parses
     * true - the parser settings have changed between 2 parses  
     * NOTE: this feature should only be set by the parser configuration.
     */
    public static final String PARSER_SETTINGS = "internal/parser-settings";
    
    // xerces properties
    
    /** Xerces properties prefix ("http://apache.org/xml/properties/"). */
    public static final String XERCES_PROPERTY_PREFIX = "http://apache.org/xml/properties/";
    
    /** Current element node property ("dom/current-element-node"). */
    public static final String CURRENT_ELEMENT_NODE_PROPERTY = "dom/current-element-node";
    
    /** Document class name property ("dom/document-class-name"). */
    public static final String DOCUMENT_CLASS_NAME_PROPERTY = "dom/document-class-name";
    
    /** Symbol table property ("internal/symbol-table"). */
    public static final String SYMBOL_TABLE_PROPERTY = "internal/symbol-table";
    
    /** Error reporter property ("internal/error-reporter"). */
    public static final String ERROR_REPORTER_PROPERTY = "internal/error-reporter";
    
    /** Error handler property ("internal/error-handler"). */
    public static final String ERROR_HANDLER_PROPERTY = "internal/error-handler";
    
    /** XInclude handler property ("internal/xinclude-handler"). */
    public static final String XINCLUDE_HANDLER_PROPERTY = "internal/xinclude-handler";
    
    /** XPointer handler property ("internal/xpointer-handler"). */
    public static final String XPOINTER_HANDLER_PROPERTY = "internal/xpointer-handler";
    
    /** Entity manager property ("internal/entity-manager"). */
    public static final String ENTITY_MANAGER_PROPERTY = "internal/entity-manager";
    
    /** Input buffer size property ("input-buffer-size"). */
    public static final String BUFFER_SIZE_PROPERTY = "input-buffer-size";
    
    /** Security manager property ("security-manager"). */
    public static final String SECURITY_MANAGER_PROPERTY = "security-manager";
    
    /** Locale property ("locale"). */
    public static final String LOCALE_PROPERTY = "locale";
    
    /** Entity resolver property ("internal/entity-resolver"). */
    public static final String ENTITY_RESOLVER_PROPERTY = "internal/entity-resolver";
    
    /** Grammar pool property ("internal/grammar-pool"). */
    public static final String XMLGRAMMAR_POOL_PROPERTY = "internal/grammar-pool";
    
    /** Datatype validator factory ("internal/datatype-validator-factory"). */
    public static final String DATATYPE_VALIDATOR_FACTORY_PROPERTY = "internal/datatype-validator-factory";
    
    /** Document scanner property ("internal/document-scanner"). */
    public static final String DOCUMENT_SCANNER_PROPERTY = "internal/document-scanner";
    
    /** DTD scanner property ("internal/dtd-scanner"). */
    public static final String DTD_SCANNER_PROPERTY = "internal/dtd-scanner";
    
    /** DTD processor property ("internal/dtd-processor"). */
    public static final String DTD_PROCESSOR_PROPERTY = "internal/dtd-processor";
    
    /** Validator property ("internal/validator"). */
    public static final String VALIDATOR_PROPERTY = "internal/validator";
    
    /** Validator property ("internal/validator/dtd"). */
    public static final String DTD_VALIDATOR_PROPERTY = "internal/validator/dtd";
    
    /** Validator property ("internal/validator/schema"). */
    public static final String SCHEMA_VALIDATOR_PROPERTY = "internal/validator/schema";
    
    /** No namespace schema location property ("schema/external-schemaLocation"). */
    public static final String SCHEMA_LOCATION = "schema/external-schemaLocation";
    
    /** Schema location property ("schema/external-noNamespaceSchemaLocation"). */
    public static final String SCHEMA_NONS_LOCATION = "schema/external-noNamespaceSchemaLocation";
    
    /** Namespace binder property ("internal/namespace-binder"). */
    public static final String NAMESPACE_BINDER_PROPERTY = "internal/namespace-binder";
    
    /** Namespace context property ("internal/namespace-context"). */
    public static final String NAMESPACE_CONTEXT_PROPERTY = "internal/namespace-context";
    
    /** Validation manager property ("internal/validation-manager"). */
    public static final String VALIDATION_MANAGER_PROPERTY = "internal/validation-manager";
    
    /** Schema type for the root element in a document ("validation/schema/root-type-definition"). */
    public static final String ROOT_TYPE_DEFINITION_PROPERTY = "validation/schema/root-type-definition";
    
    /** Schema element declaration for the root element in a document ("validation/schema/root-element-declaration"). */
    public static final String ROOT_ELEMENT_DECLARATION_PROPERTY = "validation/schema/root-element-declaration";
    
    /** Schema element declaration for the root element in a document ("internal/validation/schema/dv-factory"). */
    public static final String SCHEMA_DV_FACTORY_PROPERTY = "internal/validation/schema/dv-factory";
    
    // general constants
    
    /** Element PSVI is stored in augmentations using string "ELEMENT_PSVI" */
    public final static String ELEMENT_PSVI = "ELEMENT_PSVI";
    
    /** Attribute PSVI is stored in augmentations using string "ATTRIBUTE_PSVI" */
    public final static String ATTRIBUTE_PSVI = "ATTRIBUTE_PSVI";
    
    /** 
     * Boolean indicating whether an attribute is declared in the DTD is stored 
     * in augmentations using the string "ATTRIBUTE_DECLARED". The absence of this
     * augmentation indicates that the attribute was not declared in the DTD.
     */
    public final static String ATTRIBUTE_DECLARED = "ATTRIBUTE_DECLARED";
    
    /** 
     * Boolean indicating whether an entity referenced in the document has
     * not been read is stored in augmentations using the string "ENTITY_SKIPPED". 
     * The absence of this augmentation indicates that the entity had a 
     * declaration and was expanded.
     */
    public final static String ENTITY_SKIPPED = "ENTITY_SKIPPED";
    
    /**
     * Boolean indicating whether a character is a probable white space
     * character (ch <= 0x20) that was the replacement text of a character 
     * reference is stored in augmentations using the string "CHAR_REF_PROBABLE_WS". 
     * The absence of this augmentation indicates that the character is not 
     * probable white space and/or was not included from a character reference.
     */
    public final static String CHAR_REF_PROBABLE_WS = "CHAR_REF_PROBABLE_WS";
    
    // XML version constants 
    public final static short XML_VERSION_ERROR = -1;
    public final static short XML_VERSION_1_0 = 1;
    public final static short XML_VERSION_1_1 = 2;
    
    // Constant to enable Schema 1.1 support
    public final static boolean SCHEMA_1_1_SUPPORT = false;
    public final static short SCHEMA_VERSION_1_0          = 1;
    public final static short SCHEMA_VERSION_1_0_EXTENDED = 2;
    
    // private
    
    /** SAX features. */
    private static final String[] fgSAXFeatures = {
            NAMESPACES_FEATURE,
            NAMESPACE_PREFIXES_FEATURE,
            STRING_INTERNING_FEATURE,
            VALIDATION_FEATURE,
            EXTERNAL_GENERAL_ENTITIES_FEATURE,
            EXTERNAL_PARAMETER_ENTITIES_FEATURE,
    };
    
    /** SAX properties. */
    private static final String[] fgSAXProperties = {
            DECLARATION_HANDLER_PROPERTY,
            LEXICAL_HANDLER_PROPERTY,
            DOM_NODE_PROPERTY,
            XML_STRING_PROPERTY,
    };
    
    /** Xerces features. */
    private static final String[] fgXercesFeatures = {
            SCHEMA_VALIDATION_FEATURE,
            SCHEMA_FULL_CHECKING,
            DYNAMIC_VALIDATION_FEATURE,
            WARN_ON_DUPLICATE_ATTDEF_FEATURE,
            WARN_ON_UNDECLARED_ELEMDEF_FEATURE,
            ALLOW_JAVA_ENCODINGS_FEATURE,
            CONTINUE_AFTER_FATAL_ERROR_FEATURE,
            LOAD_DTD_GRAMMAR_FEATURE,
            LOAD_EXTERNAL_DTD_FEATURE,
            //DEFER_NODE_EXPANSION_FEATURE,
            CREATE_ENTITY_REF_NODES_FEATURE,
            INCLUDE_IGNORABLE_WHITESPACE,
            //GRAMMAR_ACCESS_FEATURE,
            DEFAULT_ATTRIBUTE_VALUES_FEATURE,
            VALIDATE_CONTENT_MODELS_FEATURE,
            VALIDATE_DATATYPES_FEATURE,
            BALANCE_SYNTAX_TREES,
            NOTIFY_CHAR_REFS_FEATURE,
            NOTIFY_BUILTIN_REFS_FEATURE,
            DISALLOW_DOCTYPE_DECL_FEATURE,
            STANDARD_URI_CONFORMANT_FEATURE,
            GENERATE_SYNTHETIC_ANNOTATIONS_FEATURE,
            VALIDATE_ANNOTATIONS_FEATURE,
            HONOUR_ALL_SCHEMALOCATIONS_FEATURE,
            XINCLUDE_FEATURE,
            XINCLUDE_FIXUP_BASE_URIS_FEATURE,
            XINCLUDE_FIXUP_LANGUAGE_FEATURE,
            IGNORE_XSI_TYPE_FEATURE,
            ID_IDREF_CHECKING_FEATURE,
            IDC_CHECKING_FEATURE,
            UNPARSED_ENTITY_CHECKING_FEATURE,
            NAMESPACE_GROWTH_FEATURE,
            TOLERATE_DUPLICATES_FEATURE,
            STRINGS_INTERNED_FEATURE,
    };
    
    /** Xerces properties. */
    private static final String[] fgXercesProperties = {
            CURRENT_ELEMENT_NODE_PROPERTY,
            DOCUMENT_CLASS_NAME_PROPERTY,
            SYMBOL_TABLE_PROPERTY,
            ERROR_HANDLER_PROPERTY,
            ERROR_REPORTER_PROPERTY,
            ENTITY_MANAGER_PROPERTY,
            ENTITY_RESOLVER_PROPERTY,
            XMLGRAMMAR_POOL_PROPERTY,
            DATATYPE_VALIDATOR_FACTORY_PROPERTY,
            DOCUMENT_SCANNER_PROPERTY,
            DTD_SCANNER_PROPERTY,
            VALIDATOR_PROPERTY,
            SCHEMA_LOCATION,
            SCHEMA_NONS_LOCATION,
            VALIDATION_MANAGER_PROPERTY,
            BUFFER_SIZE_PROPERTY,
            SECURITY_MANAGER_PROPERTY,
            LOCALE_PROPERTY,
            ROOT_TYPE_DEFINITION_PROPERTY,
            ROOT_ELEMENT_DECLARATION_PROPERTY,
            SCHEMA_DV_FACTORY_PROPERTY,
    };
    
    /** Empty enumeration. */
    private static final Enumeration fgEmptyEnumeration = new ArrayEnumeration(new Object[] {});
    
    //
    // Constructors
    //
    
    /** This class cannot be instantiated. */
    private Constants() {}
    
    //
    // Public methods
    //
    
    // sax
    
    /** Returns an enumeration of the SAX features. */
    public static Enumeration getSAXFeatures() {
        return fgSAXFeatures.length > 0
        ? new ArrayEnumeration(fgSAXFeatures) : fgEmptyEnumeration;
    } // getSAXFeatures():Enumeration
    
    /** Returns an enumeration of the SAX properties. */
    public static Enumeration getSAXProperties() {
        return fgSAXProperties.length > 0
        ? new ArrayEnumeration(fgSAXProperties) : fgEmptyEnumeration;
    } // getSAXProperties():Enumeration
    
    // xerces
    
    /** Returns an enumeration of the Xerces features. */
    public static Enumeration getXercesFeatures() {
        return fgXercesFeatures.length > 0
        ? new ArrayEnumeration(fgXercesFeatures) : fgEmptyEnumeration;
    } // getXercesFeatures():Enumeration
    
    /** Returns an enumeration of the Xerces properties. */
    public static Enumeration getXercesProperties() {
        return fgXercesProperties.length > 0
        ? new ArrayEnumeration(fgXercesProperties) : fgEmptyEnumeration;
    } // getXercesProperties():Enumeration
    
    //
    // Classes
    //
    
    /**
     * An array enumeration.
     *
     * @author Andy Clark, IBM
     */
    static class ArrayEnumeration
    implements Enumeration {
        
        //
        // Data
        //
        
        /** Array. */
        private Object[] array;
        
        /** Index. */
        private int index;
        
        //
        // Constructors
        //
        
        /** Constructs an array enumeration. */
        public ArrayEnumeration(Object[] array) {
            this.array = array;
        } // (Object[])
        
        //
        // Enumeration methods
        //
        
        /**
         * Tests if this enumeration contains more elements.
         *
         * @return  true if this enumeration contains more elements;
         *          false otherwise.
         * @since   JDK1.0
         */
        public boolean hasMoreElements() {
            return index < array.length;
        } // hasMoreElement():boolean
        
        /**
         * Returns the next element of this enumeration.
         *
         * @return     the next element of this enumeration.
         * @exception  NoSuchElementException  if no more elements exist.
         * @since      JDK1.0
         */
        public Object nextElement() {
            if (index < array.length) {
                return array[index++];
            }
            throw new NoSuchElementException();
        } // nextElement():Object
        
    } // class ArrayEnumeration
    
    //
    // MAIN
    //
    
    /** Prints all of the constants to standard output. */
    public static void main(String[] argv) {
        
        print("SAX features:", SAX_FEATURE_PREFIX, fgSAXFeatures);
        print("SAX properties:", SAX_PROPERTY_PREFIX, fgSAXProperties);
        print("Xerces features:", XERCES_FEATURE_PREFIX, fgXercesFeatures);
        print("Xerces properties:", XERCES_PROPERTY_PREFIX, fgXercesProperties);
        
    } // main(String[])
    
    /** Prints a list of features/properties. */
    private static void print(String header, String prefix, Object[] array) {
        System.out.print(header);
        if (array.length > 0) {
            System.out.println();
            for (int i = 0; i < array.length; i++) {
                System.out.print("  ");
                System.out.print(prefix);
                System.out.println(array[i]);
            }
        }
        else {
            System.out.println(" none.");
        }
    } // print(String,String,Object[])
    
} // class Constants




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