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/**
 * @file
 * 
 * @brief internal interfaces for XML Schemas
 * 
 * internal interfaces for the XML Schemas handling
 *              and schema validity checking
 *		The Schemas development is a Work In Progress.
 *              Some of those interfaces are not guaranteed to be API or ABI stable !
 *
 * @copyright See Copyright for the status of this software.
 *
 * @author Daniel Veillard
 */

#ifndef __XML_SCHEMA_INTERNALS_H__
#define __XML_SCHEMA_INTERNALS_H__

#include <libxml/xmlversion.h>

#ifdef LIBXML_SCHEMAS_ENABLED

#include <libxml/xmlregexp.h>
#include <libxml/hash.h>
#include <libxml/dict.h>
#include <libxml/tree.h>

#ifdef __cplusplus
extern "C" {
#endif

/**
 * Schema value type
 */
typedef enum {
    XML_SCHEMAS_UNKNOWN = 0,
    XML_SCHEMAS_STRING = 1,
    XML_SCHEMAS_NORMSTRING = 2,
    XML_SCHEMAS_DECIMAL = 3,
    XML_SCHEMAS_TIME = 4,
    XML_SCHEMAS_GDAY = 5,
    XML_SCHEMAS_GMONTH = 6,
    XML_SCHEMAS_GMONTHDAY = 7,
    XML_SCHEMAS_GYEAR = 8,
    XML_SCHEMAS_GYEARMONTH = 9,
    XML_SCHEMAS_DATE = 10,
    XML_SCHEMAS_DATETIME = 11,
    XML_SCHEMAS_DURATION = 12,
    XML_SCHEMAS_FLOAT = 13,
    XML_SCHEMAS_DOUBLE = 14,
    XML_SCHEMAS_BOOLEAN = 15,
    XML_SCHEMAS_TOKEN = 16,
    XML_SCHEMAS_LANGUAGE = 17,
    XML_SCHEMAS_NMTOKEN = 18,
    XML_SCHEMAS_NMTOKENS = 19,
    XML_SCHEMAS_NAME = 20,
    XML_SCHEMAS_QNAME = 21,
    XML_SCHEMAS_NCNAME = 22,
    XML_SCHEMAS_ID = 23,
    XML_SCHEMAS_IDREF = 24,
    XML_SCHEMAS_IDREFS = 25,
    XML_SCHEMAS_ENTITY = 26,
    XML_SCHEMAS_ENTITIES = 27,
    XML_SCHEMAS_NOTATION = 28,
    XML_SCHEMAS_ANYURI = 29,
    XML_SCHEMAS_INTEGER = 30,
    XML_SCHEMAS_NPINTEGER = 31,
    XML_SCHEMAS_NINTEGER = 32,
    XML_SCHEMAS_NNINTEGER = 33,
    XML_SCHEMAS_PINTEGER = 34,
    XML_SCHEMAS_INT = 35,
    XML_SCHEMAS_UINT = 36,
    XML_SCHEMAS_LONG = 37,
    XML_SCHEMAS_ULONG = 38,
    XML_SCHEMAS_SHORT = 39,
    XML_SCHEMAS_USHORT = 40,
    XML_SCHEMAS_BYTE = 41,
    XML_SCHEMAS_UBYTE = 42,
    XML_SCHEMAS_HEXBINARY = 43,
    XML_SCHEMAS_BASE64BINARY = 44,
    XML_SCHEMAS_ANYTYPE = 45,
    XML_SCHEMAS_ANYSIMPLETYPE = 46
} xmlSchemaValType;

/**
 * XML Schemas defines multiple type of types.
 */
typedef enum {
    XML_SCHEMA_TYPE_BASIC = 1, /* A built-in datatype */
    XML_SCHEMA_TYPE_ANY,
    XML_SCHEMA_TYPE_FACET,
    XML_SCHEMA_TYPE_SIMPLE,
    XML_SCHEMA_TYPE_COMPLEX,
    XML_SCHEMA_TYPE_SEQUENCE = 6,
    XML_SCHEMA_TYPE_CHOICE,
    XML_SCHEMA_TYPE_ALL,
    XML_SCHEMA_TYPE_SIMPLE_CONTENT,
    XML_SCHEMA_TYPE_COMPLEX_CONTENT,
    XML_SCHEMA_TYPE_UR,
    XML_SCHEMA_TYPE_RESTRICTION,
    XML_SCHEMA_TYPE_EXTENSION,
    XML_SCHEMA_TYPE_ELEMENT,
    XML_SCHEMA_TYPE_ATTRIBUTE,
    XML_SCHEMA_TYPE_ATTRIBUTEGROUP,
    XML_SCHEMA_TYPE_GROUP,
    XML_SCHEMA_TYPE_NOTATION,
    XML_SCHEMA_TYPE_LIST,
    XML_SCHEMA_TYPE_UNION,
    XML_SCHEMA_TYPE_ANY_ATTRIBUTE,
    XML_SCHEMA_TYPE_IDC_UNIQUE,
    XML_SCHEMA_TYPE_IDC_KEY,
    XML_SCHEMA_TYPE_IDC_KEYREF,
    XML_SCHEMA_TYPE_PARTICLE = 25,
    XML_SCHEMA_TYPE_ATTRIBUTE_USE,
    XML_SCHEMA_FACET_MININCLUSIVE = 1000,
    XML_SCHEMA_FACET_MINEXCLUSIVE,
    XML_SCHEMA_FACET_MAXINCLUSIVE,
    XML_SCHEMA_FACET_MAXEXCLUSIVE,
    XML_SCHEMA_FACET_TOTALDIGITS,
    XML_SCHEMA_FACET_FRACTIONDIGITS,
    XML_SCHEMA_FACET_PATTERN,
    XML_SCHEMA_FACET_ENUMERATION,
    XML_SCHEMA_FACET_WHITESPACE,
    XML_SCHEMA_FACET_LENGTH,
    XML_SCHEMA_FACET_MAXLENGTH,
    XML_SCHEMA_FACET_MINLENGTH,
    XML_SCHEMA_EXTRA_QNAMEREF = 2000,
    XML_SCHEMA_EXTRA_ATTR_USE_PROHIB
} xmlSchemaTypeType;

/**
 * Schema content type
 */
typedef enum {
    XML_SCHEMA_CONTENT_UNKNOWN = 0,
    XML_SCHEMA_CONTENT_EMPTY = 1,
    XML_SCHEMA_CONTENT_ELEMENTS,
    XML_SCHEMA_CONTENT_MIXED,
    XML_SCHEMA_CONTENT_SIMPLE,
    XML_SCHEMA_CONTENT_MIXED_OR_ELEMENTS, /* Obsolete */
    XML_SCHEMA_CONTENT_BASIC,
    XML_SCHEMA_CONTENT_ANY
} xmlSchemaContentType;

/** Schema value */
typedef struct _xmlSchemaVal xmlSchemaVal;
typedef xmlSchemaVal *xmlSchemaValPtr;

/** Schema type */
typedef struct _xmlSchemaType xmlSchemaType;
typedef xmlSchemaType *xmlSchemaTypePtr;

/** Schema facet */
typedef struct _xmlSchemaFacet xmlSchemaFacet;
typedef xmlSchemaFacet *xmlSchemaFacetPtr;

/** Schema annotation */
typedef struct _xmlSchemaAnnot xmlSchemaAnnot;
typedef xmlSchemaAnnot *xmlSchemaAnnotPtr;
/**
 * Annotation
 */
struct _xmlSchemaAnnot {
    struct _xmlSchemaAnnot *next;
    xmlNode *content;         /* the annotation */
};

/**
 * Skip unknown attribute from validation
 * Obsolete, not used anymore.
 */
#define XML_SCHEMAS_ANYATTR_SKIP        1
/**
 * Ignore validation non definition on attributes
 * Obsolete, not used anymore.
 */
#define XML_SCHEMAS_ANYATTR_LAX                2
/**
 * Apply strict validation rules on attributes
 * Obsolete, not used anymore.
 */
#define XML_SCHEMAS_ANYATTR_STRICT        3
/**
 * Skip unknown attribute from validation
 */
#define XML_SCHEMAS_ANY_SKIP        1
/**
 * Used by wildcards.
 * Validate if type found, don't worry if not found
 */
#define XML_SCHEMAS_ANY_LAX                2
/**
 * Used by wildcards.
 * Apply strict validation rules
 */
#define XML_SCHEMAS_ANY_STRICT        3
/**
 * Used by wildcards.
 * The attribute is prohibited.
 */
#define XML_SCHEMAS_ATTR_USE_PROHIBITED 0
/**
 * The attribute is required.
 */
#define XML_SCHEMAS_ATTR_USE_REQUIRED 1
/**
 * The attribute is optional.
 */
#define XML_SCHEMAS_ATTR_USE_OPTIONAL 2
/**
 * allow elements in no namespace
 */
#define XML_SCHEMAS_ATTR_GLOBAL        1 << 0
/**
 * allow elements in no namespace
 */
#define XML_SCHEMAS_ATTR_NSDEFAULT        1 << 7
/**
 * this is set when the "type" and "ref" references
 * have been resolved.
 */
#define XML_SCHEMAS_ATTR_INTERNAL_RESOLVED        1 << 8
/**
 * the attribute has a fixed value
 */
#define XML_SCHEMAS_ATTR_FIXED        1 << 9

/** Schema attribute definition */
typedef struct _xmlSchemaAttribute xmlSchemaAttribute;
typedef xmlSchemaAttribute *xmlSchemaAttributePtr;
/**
 * An attribute definition.
 */
struct _xmlSchemaAttribute {
    xmlSchemaTypeType type;
    struct _xmlSchemaAttribute *next; /* the next attribute (not used?) */
    const xmlChar *name; /* the name of the declaration */
    const xmlChar *id; /* Deprecated; not used */
    const xmlChar *ref; /* Deprecated; not used */
    const xmlChar *refNs; /* Deprecated; not used */
    const xmlChar *typeName; /* the local name of the type definition */
    const xmlChar *typeNs; /* the ns URI of the type definition */
    xmlSchemaAnnot *annot;

xmlSchemaType *base; /* Deprecated; not used */
    int occurs; /* Deprecated; not used */
    const xmlChar *defValue; /* The initial value of the value constraint */
    xmlSchemaType *subtypes; /* the type definition */
    xmlNode *node;
    const xmlChar *targetNamespace;
    int flags;
    const xmlChar *refPrefix; /* Deprecated; not used */
    xmlSchemaVal *defVal; /* The compiled value constraint */
    xmlSchemaAttribute *refDecl; /* Deprecated; not used */
};

/** Linked list of schema attributes */
typedef struct _xmlSchemaAttributeLink xmlSchemaAttributeLink;
typedef xmlSchemaAttributeLink *xmlSchemaAttributeLinkPtr;
/**
 * Used to build a list of attribute uses on complexType definitions.
 * WARNING: Deprecated; not used.
 */
struct _xmlSchemaAttributeLink {
    struct _xmlSchemaAttributeLink *next;/* the next attribute link ... */
    struct _xmlSchemaAttribute *attr;/* the linked attribute */
};

/**
 * If the wildcard is complete.
 */
#define XML_SCHEMAS_WILDCARD_COMPLETE 1 << 0

/** Namespace wildcard */
typedef struct _xmlSchemaWildcardNs xmlSchemaWildcardNs;
typedef xmlSchemaWildcardNs *xmlSchemaWildcardNsPtr;
/**
 * Used to build a list of namespaces on wildcards.
 */
struct _xmlSchemaWildcardNs {
    struct _xmlSchemaWildcardNs *next;/* the next constraint link ... */
    const xmlChar *value;/* the value */
};

/** Name wildcard */
typedef struct _xmlSchemaWildcard xmlSchemaWildcard;
typedef xmlSchemaWildcard *xmlSchemaWildcardPtr;
/**
 * A wildcard.
 */
struct _xmlSchemaWildcard {
    xmlSchemaTypeType type;        /* The kind of type */
    const xmlChar *id; /* Deprecated; not used */
    xmlSchemaAnnot *annot;
    xmlNode *node;
    int minOccurs; /* Deprecated; not used */
    int maxOccurs; /* Deprecated; not used */
    int processContents;
    int any; /* Indicates if the ns constraint is of ##any */
    xmlSchemaWildcardNs *nsSet; /* The list of allowed namespaces */
    xmlSchemaWildcardNs *negNsSet; /* The negated namespace */
    int flags;
};

/**
 * The attribute wildcard has been built.
 */
#define XML_SCHEMAS_ATTRGROUP_WILDCARD_BUILDED 1 << 0
/**
 * The attribute group has been defined.
 */
#define XML_SCHEMAS_ATTRGROUP_GLOBAL 1 << 1
/**
 * Marks the attr group as marked; used for circular checks.
 */
#define XML_SCHEMAS_ATTRGROUP_MARKED 1 << 2

/**
 * The attr group was redefined.
 */
#define XML_SCHEMAS_ATTRGROUP_REDEFINED 1 << 3
/**
 * Whether this attr. group contains attr. group references.
 */
#define XML_SCHEMAS_ATTRGROUP_HAS_REFS 1 << 4

/** Attribute group */
typedef struct _xmlSchemaAttributeGroup xmlSchemaAttributeGroup;
typedef xmlSchemaAttributeGroup *xmlSchemaAttributeGroupPtr;
/**
 * An attribute group definition.
 *
 * xmlSchemaAttribute and xmlSchemaAttributeGroup start of structures
 * must be kept similar
 */
struct _xmlSchemaAttributeGroup {
    xmlSchemaTypeType type;        /* The kind of type */
    struct _xmlSchemaAttribute *next;/* the next attribute if in a group ... */
    const xmlChar *name;
    const xmlChar *id;
    const xmlChar *ref; /* Deprecated; not used */
    const xmlChar *refNs; /* Deprecated; not used */
    xmlSchemaAnnot *annot;

xmlSchemaAttribute *attributes; /* Deprecated; not used */
    xmlNode *node;
    int flags;
    xmlSchemaWildcard *attributeWildcard;
    const xmlChar *refPrefix; /* Deprecated; not used */
    xmlSchemaAttributeGroup *refItem; /* Deprecated; not used */
    const xmlChar *targetNamespace;
    void *attrUses;
};

/** Linked list of schema types */
typedef struct _xmlSchemaTypeLink xmlSchemaTypeLink;
typedef xmlSchemaTypeLink *xmlSchemaTypeLinkPtr;
/**
 * Used to build a list of types (e.g. member types of
 * simpleType with variety "union").
 */
struct _xmlSchemaTypeLink {
    struct _xmlSchemaTypeLink *next;/* the next type link ... */
    xmlSchemaType *type;/* the linked type */
};

/** Linked list of schema facets */
typedef struct _xmlSchemaFacetLink xmlSchemaFacetLink;
typedef xmlSchemaFacetLink *xmlSchemaFacetLinkPtr;
/**
 * Used to build a list of facets.
 */
struct _xmlSchemaFacetLink {
    struct _xmlSchemaFacetLink *next;/* the next facet link ... */
    xmlSchemaFacet *facet;/* the linked facet */
};

/**
 * the element content type is mixed
 */
#define XML_SCHEMAS_TYPE_MIXED                1 << 0
/**
 * the simple or complex type has a derivation method of "extension".
 */
#define XML_SCHEMAS_TYPE_DERIVATION_METHOD_EXTENSION                1 << 1
/**
 * the simple or complex type has a derivation method of "restriction".
 */
#define XML_SCHEMAS_TYPE_DERIVATION_METHOD_RESTRICTION                1 << 2
/**
 * the type is global
 */
#define XML_SCHEMAS_TYPE_GLOBAL                1 << 3
/**
 * the complexType owns an attribute wildcard, i.e.
 * it can be freed by the complexType
 */
#define XML_SCHEMAS_TYPE_OWNED_ATTR_WILDCARD    1 << 4 /* Obsolete. */
/**
 * the simpleType has a variety of "absent".
 * TODO: Actually not necessary :-/, since if
 * none of the variety flags occur then it's
 * automatically absent.
 */
#define XML_SCHEMAS_TYPE_VARIETY_ABSENT    1 << 5
/**
 * the simpleType has a variety of "list".
 */
#define XML_SCHEMAS_TYPE_VARIETY_LIST    1 << 6
/**
 * the simpleType has a variety of "union".
 */
#define XML_SCHEMAS_TYPE_VARIETY_UNION    1 << 7
/**
 * the simpleType has a variety of "union".
 */
#define XML_SCHEMAS_TYPE_VARIETY_ATOMIC    1 << 8
/**
 * the complexType has a final of "extension".
 */
#define XML_SCHEMAS_TYPE_FINAL_EXTENSION    1 << 9
/**
 * the simpleType/complexType has a final of "restriction".
 */
#define XML_SCHEMAS_TYPE_FINAL_RESTRICTION    1 << 10
/**
 * the simpleType has a final of "list".
 */
#define XML_SCHEMAS_TYPE_FINAL_LIST    1 << 11
/**
 * the simpleType has a final of "union".
 */
#define XML_SCHEMAS_TYPE_FINAL_UNION    1 << 12
/**
 * the simpleType has a final of "default".
 */
#define XML_SCHEMAS_TYPE_FINAL_DEFAULT    1 << 13
/**
 * Marks the item as a builtin primitive.
 */
#define XML_SCHEMAS_TYPE_BUILTIN_PRIMITIVE    1 << 14
/**
 * Marks the item as marked; used for circular checks.
 */
#define XML_SCHEMAS_TYPE_MARKED        1 << 16
/**
 * the complexType did not specify 'block' so use the default of the
 * `<schema>` item.
 */
#define XML_SCHEMAS_TYPE_BLOCK_DEFAULT    1 << 17
/**
 * the complexType has a 'block' of "extension".
 */
#define XML_SCHEMAS_TYPE_BLOCK_EXTENSION    1 << 18
/**
 * the complexType has a 'block' of "restriction".
 */
#define XML_SCHEMAS_TYPE_BLOCK_RESTRICTION    1 << 19
/**
 * the simple/complexType is abstract.
 */
#define XML_SCHEMAS_TYPE_ABSTRACT    1 << 20
/**
 * indicates if the facets need a computed value
 */
#define XML_SCHEMAS_TYPE_FACETSNEEDVALUE    1 << 21
/**
 * indicates that the type was typefixed
 */
#define XML_SCHEMAS_TYPE_INTERNAL_RESOLVED    1 << 22
/**
 * indicates that the type is invalid
 */
#define XML_SCHEMAS_TYPE_INTERNAL_INVALID    1 << 23
/**
 * a whitespace-facet value of "preserve"
 */
#define XML_SCHEMAS_TYPE_WHITESPACE_PRESERVE    1 << 24
/**
 * a whitespace-facet value of "replace"
 */
#define XML_SCHEMAS_TYPE_WHITESPACE_REPLACE    1 << 25
/**
 * a whitespace-facet value of "collapse"
 */
#define XML_SCHEMAS_TYPE_WHITESPACE_COLLAPSE    1 << 26
/**
 * has facets
 */
#define XML_SCHEMAS_TYPE_HAS_FACETS    1 << 27
/**
 * indicates if the facets (pattern) need a normalized value
 */
#define XML_SCHEMAS_TYPE_NORMVALUENEEDED    1 << 28

/**
 * First stage of fixup was done.
 */
#define XML_SCHEMAS_TYPE_FIXUP_1    1 << 29

/**
 * The type was redefined.
 */
#define XML_SCHEMAS_TYPE_REDEFINED    1 << 30
#if 0
/**
 * The type redefines an other type.
 */
#define XML_SCHEMAS_TYPE_REDEFINING    1 << 31
#endif

/**
 * Schemas type definition.
 */
struct _xmlSchemaType {
    xmlSchemaTypeType type; /* The kind of type */
    struct _xmlSchemaType *next; /* the next type if in a sequence ... */
    const xmlChar *name;
    const xmlChar *id ; /* Deprecated; not used */
    const xmlChar *ref; /* Deprecated; not used */
    const xmlChar *refNs; /* Deprecated; not used */
    xmlSchemaAnnot *annot;
    xmlSchemaType *subtypes;
    xmlSchemaAttribute *attributes; /* Deprecated; not used */
    xmlNode *node;
    int minOccurs; /* Deprecated; not used */
    int maxOccurs; /* Deprecated; not used */

int flags;
    xmlSchemaContentType contentType;
    const xmlChar *base; /* Base type's local name */
    const xmlChar *baseNs; /* Base type's target namespace */
    xmlSchemaType *baseType; /* The base type component */
    xmlSchemaFacet *facets; /* Local facets */
    struct _xmlSchemaType *redef; /* Deprecated; not used */
    int recurse; /* Obsolete */
    xmlSchemaAttributeLink **attributeUses; /* Deprecated; not used */
    xmlSchemaWildcard *attributeWildcard;
    int builtInType; /* Type of built-in types. */
    xmlSchemaTypeLink *memberTypes; /* member-types if a union type. */
    xmlSchemaFacetLink *facetSet; /* All facets (incl. inherited) */
    const xmlChar *refPrefix; /* Deprecated; not used */
    xmlSchemaType *contentTypeDef; /* Used for the simple content of complex types.
                                        Could we use @subtypes for this? */
    xmlRegexp *contModel; /* Holds the automaton of the content model */
    const xmlChar *targetNamespace;
    void *attrUses;
};

/**
 * the element is nillable
 */
#define XML_SCHEMAS_ELEM_NILLABLE        1 << 0
/**
 * the element is global
 */
#define XML_SCHEMAS_ELEM_GLOBAL                1 << 1
/**
 * the element has a default value
 */
#define XML_SCHEMAS_ELEM_DEFAULT        1 << 2
/**
 * the element has a fixed value
 */
#define XML_SCHEMAS_ELEM_FIXED                1 << 3
/**
 * the element is abstract
 */
#define XML_SCHEMAS_ELEM_ABSTRACT        1 << 4
/**
 * the element is top level
 * obsolete: use XML_SCHEMAS_ELEM_GLOBAL instead
 */
#define XML_SCHEMAS_ELEM_TOPLEVEL        1 << 5
/**
 * the element is a reference to a type
 */
#define XML_SCHEMAS_ELEM_REF                1 << 6
/**
 * allow elements in no namespace
 * Obsolete, not used anymore.
 */
#define XML_SCHEMAS_ELEM_NSDEFAULT        1 << 7
/**
 * this is set when "type", "ref", "substitutionGroup"
 * references have been resolved.
 */
#define XML_SCHEMAS_ELEM_INTERNAL_RESOLVED        1 << 8
 /**
 * a helper flag for the search of circular references.
 */
#define XML_SCHEMAS_ELEM_CIRCULAR        1 << 9
/**
 * the "block" attribute is absent
 */
#define XML_SCHEMAS_ELEM_BLOCK_ABSENT        1 << 10
/**
 * disallowed substitutions are absent
 */
#define XML_SCHEMAS_ELEM_BLOCK_EXTENSION        1 << 11
/**
 * disallowed substitutions: "restriction"
 */
#define XML_SCHEMAS_ELEM_BLOCK_RESTRICTION        1 << 12
/**
 * disallowed substitutions: "substitution"
 */
#define XML_SCHEMAS_ELEM_BLOCK_SUBSTITUTION        1 << 13
/**
 * substitution group exclusions are absent
 */
#define XML_SCHEMAS_ELEM_FINAL_ABSENT        1 << 14
/**
 * substitution group exclusions: "extension"
 */
#define XML_SCHEMAS_ELEM_FINAL_EXTENSION        1 << 15
/**
 * substitution group exclusions: "restriction"
 */
#define XML_SCHEMAS_ELEM_FINAL_RESTRICTION        1 << 16
/**
 * the declaration is a substitution group head
 */
#define XML_SCHEMAS_ELEM_SUBST_GROUP_HEAD        1 << 17
/**
 * this is set when the elem decl has been checked against
 * all constraints
 */
#define XML_SCHEMAS_ELEM_INTERNAL_CHECKED        1 << 18

/** Schema element definition */
typedef struct _xmlSchemaElement xmlSchemaElement;
typedef xmlSchemaElement *xmlSchemaElementPtr;
/**
 * An element definition.
 *
 * xmlSchemaType, xmlSchemaFacet and xmlSchemaElement start of
 * structures must be kept similar
 */
struct _xmlSchemaElement {
    xmlSchemaTypeType type; /* The kind of type */
    struct _xmlSchemaType *next; /* Not used? */
    const xmlChar *name;
    const xmlChar *id; /* Deprecated; not used */
    const xmlChar *ref; /* Deprecated; not used */
    const xmlChar *refNs; /* Deprecated; not used */
    xmlSchemaAnnot *annot;
    xmlSchemaType *subtypes; /* the type definition */
    xmlSchemaAttribute *attributes;
    xmlNode *node;
    int minOccurs; /* Deprecated; not used */
    int maxOccurs; /* Deprecated; not used */

int flags;
    const xmlChar *targetNamespace;
    const xmlChar *namedType;
    const xmlChar *namedTypeNs;
    const xmlChar *substGroup;
    const xmlChar *substGroupNs;
    const xmlChar *scope;
    const xmlChar *value; /* The original value of the value constraint. */
    struct _xmlSchemaElement *refDecl; /* This will now be used for the
                                          substitution group affiliation */
    xmlRegexp *contModel; /* Obsolete for WXS, maybe used for RelaxNG */
    xmlSchemaContentType contentType;
    const xmlChar *refPrefix; /* Deprecated; not used */
    xmlSchemaVal *defVal; /* The compiled value constraint. */
    void *idcs; /* The identity-constraint defs */
};

/**
 * unknown facet handling
 */
#define XML_SCHEMAS_FACET_UNKNOWN        0
/**
 * preserve the type of the facet
 */
#define XML_SCHEMAS_FACET_PRESERVE        1
/**
 * replace the type of the facet
 */
#define XML_SCHEMAS_FACET_REPLACE        2
/**
 * collapse the types of the facet
 */
#define XML_SCHEMAS_FACET_COLLAPSE        3
/**
 * A facet definition.
 */
struct _xmlSchemaFacet {
    xmlSchemaTypeType type;        /* The kind of type */
    struct _xmlSchemaFacet *next;/* the next type if in a sequence ... */
    const xmlChar *value; /* The original value */
    const xmlChar *id; /* Obsolete */
    xmlSchemaAnnot *annot;
    xmlNode *node;
    int fixed; /* XML_SCHEMAS_FACET_PRESERVE, etc. */
    int whitespace;
    xmlSchemaVal *val; /* The compiled value */
    xmlRegexp      *regexp; /* The regex for patterns */
};

/** Schema notation */
typedef struct _xmlSchemaNotation xmlSchemaNotation;
typedef xmlSchemaNotation *xmlSchemaNotationPtr;
/**
 * A notation definition.
 */
struct _xmlSchemaNotation {
    xmlSchemaTypeType type; /* The kind of type */
    const xmlChar *name;
    xmlSchemaAnnot *annot;
    const xmlChar *identifier;
    const xmlChar *targetNamespace;
};

/*
* TODO: Actually all those flags used for the schema should sit
* on the schema parser context, since they are used only
* during parsing an XML schema document, and not available
* on the component level as per spec.
*/
/**
 * Reflects elementFormDefault == qualified in
 * an XML schema document.
 */
#define XML_SCHEMAS_QUALIF_ELEM                1 << 0
/**
 * Reflects attributeFormDefault == qualified in
 * an XML schema document.
 */
#define XML_SCHEMAS_QUALIF_ATTR            1 << 1
/**
 * the schema has "extension" in the set of finalDefault.
 */
#define XML_SCHEMAS_FINAL_DEFAULT_EXTENSION        1 << 2
/**
 * the schema has "restriction" in the set of finalDefault.
 */
#define XML_SCHEMAS_FINAL_DEFAULT_RESTRICTION            1 << 3
/**
 * the schema has "list" in the set of finalDefault.
 */
#define XML_SCHEMAS_FINAL_DEFAULT_LIST            1 << 4
/**
 * the schema has "union" in the set of finalDefault.
 */
#define XML_SCHEMAS_FINAL_DEFAULT_UNION            1 << 5
/**
 * the schema has "extension" in the set of blockDefault.
 */
#define XML_SCHEMAS_BLOCK_DEFAULT_EXTENSION            1 << 6
/**
 * the schema has "restriction" in the set of blockDefault.
 */
#define XML_SCHEMAS_BLOCK_DEFAULT_RESTRICTION            1 << 7
/**
 * the schema has "substitution" in the set of blockDefault.
 */
#define XML_SCHEMAS_BLOCK_DEFAULT_SUBSTITUTION            1 << 8
/**
 * the schema is currently including an other schema with
 * no target namespace.
 */
#define XML_SCHEMAS_INCLUDING_CONVERT_NS            1 << 9
/**
 * A Schemas definition
 */
struct _xmlSchema {
    const xmlChar *name; /* schema name */
    const xmlChar *targetNamespace; /* the target namespace */
    const xmlChar *version;
    const xmlChar *id; /* Obsolete */
    xmlDoc *doc;
    xmlSchemaAnnot *annot;
    int flags;

xmlHashTable *typeDecl;
    xmlHashTable *attrDecl;
    xmlHashTable *attrgrpDecl;
    xmlHashTable *elemDecl;
    xmlHashTable *notaDecl;

xmlHashTable *schemasImports;

void *_private;        /* unused by the library for users or bindings */
    xmlHashTable *groupDecl;
    xmlDict        *dict;
    void *includes;     /* the includes, this is opaque for now */
    int preserve;        /* whether to free the document */
    int counter; /* used to give anonymous components unique names */
    xmlHashTable *idcDef; /* All identity-constraint defs. */
    void *volatiles; /* Obsolete */
};

XMLPUBFUN void         xmlSchemaFreeType        (xmlSchemaType *type);
XMLPUBFUN void         xmlSchemaFreeWildcard(xmlSchemaWildcard *wildcard);

#ifdef __cplusplus
}
#endif

#endif /* LIBXML_SCHEMAS_ENABLED */
#endif /* __XML_SCHEMA_INTERNALS_H__ */

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