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/*
 * Summary: internal interfaces for XML Schemas
 * Description: 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 garanteed to be API or ABI stable !
 *
 * Copy: 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>

#ifdef __cplusplus
extern "C" {
#endif

typedef enum {
    XML_SCHEMAS_UNKNOWN = 0,
    XML_SCHEMAS_STRING,
    XML_SCHEMAS_NORMSTRING,
    XML_SCHEMAS_DECIMAL,
    XML_SCHEMAS_TIME,
    XML_SCHEMAS_GDAY,
    XML_SCHEMAS_GMONTH,
    XML_SCHEMAS_GMONTHDAY,
    XML_SCHEMAS_GYEAR,
    XML_SCHEMAS_GYEARMONTH,
    XML_SCHEMAS_DATE,
    XML_SCHEMAS_DATETIME,
    XML_SCHEMAS_DURATION,
    XML_SCHEMAS_FLOAT,
    XML_SCHEMAS_DOUBLE,
    XML_SCHEMAS_BOOLEAN,
    XML_SCHEMAS_TOKEN,
    XML_SCHEMAS_LANGUAGE,
    XML_SCHEMAS_NMTOKEN,
    XML_SCHEMAS_NMTOKENS,
    XML_SCHEMAS_NAME,
    XML_SCHEMAS_QNAME,
    XML_SCHEMAS_NCNAME,
    XML_SCHEMAS_ID,
    XML_SCHEMAS_IDREF,
    XML_SCHEMAS_IDREFS,
    XML_SCHEMAS_ENTITY,
    XML_SCHEMAS_ENTITIES,
    XML_SCHEMAS_NOTATION,
    XML_SCHEMAS_ANYURI,
    XML_SCHEMAS_INTEGER,
    XML_SCHEMAS_NPINTEGER,
    XML_SCHEMAS_NINTEGER,
    XML_SCHEMAS_NNINTEGER,
    XML_SCHEMAS_PINTEGER,
    XML_SCHEMAS_INT,
    XML_SCHEMAS_UINT,
    XML_SCHEMAS_LONG,
    XML_SCHEMAS_ULONG,
    XML_SCHEMAS_SHORT,
    XML_SCHEMAS_USHORT,
    XML_SCHEMAS_BYTE,
    XML_SCHEMAS_UBYTE,
    XML_SCHEMAS_HEXBINARY,
    XML_SCHEMAS_BASE64BINARY,
    XML_SCHEMAS_ANYTYPE,
    XML_SCHEMAS_ANYSIMPLETYPE
} 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;

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;

typedef struct _xmlSchemaVal xmlSchemaVal;
typedef xmlSchemaVal *xmlSchemaValPtr;

typedef struct _xmlSchemaType xmlSchemaType;
typedef xmlSchemaType *xmlSchemaTypePtr;

typedef struct _xmlSchemaFacet xmlSchemaFacet;
typedef xmlSchemaFacet *xmlSchemaFacetPtr;

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

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

/**
 * xmlSchemaAttribute:
 * An attribute definition.
 */

typedef struct _xmlSchemaAttribute xmlSchemaAttribute;
typedef xmlSchemaAttribute *xmlSchemaAttributePtr;
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 */
    xmlSchemaAnnotPtr annot;

xmlSchemaTypePtr base; /* Deprecated; not used */
    int occurs; /* Deprecated; not used */
    const xmlChar *defValue; /* The initial value of the value constraint */
    xmlSchemaTypePtr subtypes; /* the type definition */
    xmlNodePtr node;
    const xmlChar *targetNamespace;
    int flags;
    const xmlChar *refPrefix; /* Deprecated; not used */
    xmlSchemaValPtr defVal; /* The compiled value constraint */
    xmlSchemaAttributePtr refDecl; /* Deprecated; not used */
};

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

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

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

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

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

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

/**
 * An attribute group definition.
 *
 * xmlSchemaAttribute and xmlSchemaAttributeGroup start of structures
 * must be kept similar
 */
typedef struct _xmlSchemaAttributeGroup xmlSchemaAttributeGroup;
typedef xmlSchemaAttributeGroup *xmlSchemaAttributeGroupPtr;
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 */
    xmlSchemaAnnotPtr annot;

xmlSchemaAttributePtr attributes; /* Deprecated; not used */
    xmlNodePtr node;
    int flags;
    xmlSchemaWildcardPtr attributeWildcard;
    const xmlChar *refPrefix; /* Deprecated; not used */
    xmlSchemaAttributeGroupPtr refItem; /* Deprecated; not used */
    const xmlChar *targetNamespace;
    void *attrUses;
};

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

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

/**
 * XML_SCHEMAS_TYPE_MIXED:
 *
 * the element content type is mixed
 */
#define XML_SCHEMAS_TYPE_MIXED                1 << 0
/**
 * XML_SCHEMAS_TYPE_DERIVATION_METHOD_EXTENSION:
 *
 * the simple or complex type has a derivation method of "extension".
 */
#define XML_SCHEMAS_TYPE_DERIVATION_METHOD_EXTENSION                1 << 1
/**
 * XML_SCHEMAS_TYPE_DERIVATION_METHOD_RESTRICTION:
 *
 * the simple or complex type has a derivation method of "restriction".
 */
#define XML_SCHEMAS_TYPE_DERIVATION_METHOD_RESTRICTION                1 << 2
/**
 * XML_SCHEMAS_TYPE_GLOBAL:
 *
 * the type is global
 */
#define XML_SCHEMAS_TYPE_GLOBAL                1 << 3
/**
 * XML_SCHEMAS_TYPE_OWNED_ATTR_WILDCARD:
 *
 * 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. */
/**
 * XML_SCHEMAS_TYPE_VARIETY_ABSENT:
 *
 * 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
/**
 * XML_SCHEMAS_TYPE_VARIETY_LIST:
 *
 * the simpleType has a variety of "list".
 */
#define XML_SCHEMAS_TYPE_VARIETY_LIST    1 << 6
/**
 * XML_SCHEMAS_TYPE_VARIETY_UNION:
 *
 * the simpleType has a variety of "union".
 */
#define XML_SCHEMAS_TYPE_VARIETY_UNION    1 << 7
/**
 * XML_SCHEMAS_TYPE_VARIETY_ATOMIC:
 *
 * the simpleType has a variety of "union".
 */
#define XML_SCHEMAS_TYPE_VARIETY_ATOMIC    1 << 8
/**
 * XML_SCHEMAS_TYPE_FINAL_EXTENSION:
 *
 * the complexType has a final of "extension".
 */
#define XML_SCHEMAS_TYPE_FINAL_EXTENSION    1 << 9
/**
 * XML_SCHEMAS_TYPE_FINAL_RESTRICTION:
 *
 * the simpleType/complexType has a final of "restriction".
 */
#define XML_SCHEMAS_TYPE_FINAL_RESTRICTION    1 << 10
/**
 * XML_SCHEMAS_TYPE_FINAL_LIST:
 *
 * the simpleType has a final of "list".
 */
#define XML_SCHEMAS_TYPE_FINAL_LIST    1 << 11
/**
 * XML_SCHEMAS_TYPE_FINAL_UNION:
 *
 * the simpleType has a final of "union".
 */
#define XML_SCHEMAS_TYPE_FINAL_UNION    1 << 12
/**
 * XML_SCHEMAS_TYPE_FINAL_DEFAULT:
 *
 * the simpleType has a final of "default".
 */
#define XML_SCHEMAS_TYPE_FINAL_DEFAULT    1 << 13
/**
 * XML_SCHEMAS_TYPE_BUILTIN_PRIMITIVE:
 *
 * Marks the item as a builtin primitive.
 */
#define XML_SCHEMAS_TYPE_BUILTIN_PRIMITIVE    1 << 14
/**
 * XML_SCHEMAS_TYPE_MARKED:
 *
 * Marks the item as marked; used for circular checks.
 */
#define XML_SCHEMAS_TYPE_MARKED        1 << 16
/**
 * XML_SCHEMAS_TYPE_BLOCK_DEFAULT:
 *
 * the complexType did not specify 'block' so use the default of the
 * <schema> item.
 */
#define XML_SCHEMAS_TYPE_BLOCK_DEFAULT    1 << 17
/**
 * XML_SCHEMAS_TYPE_BLOCK_EXTENSION:
 *
 * the complexType has a 'block' of "extension".
 */
#define XML_SCHEMAS_TYPE_BLOCK_EXTENSION    1 << 18
/**
 * XML_SCHEMAS_TYPE_BLOCK_RESTRICTION:
 *
 * the complexType has a 'block' of "restriction".
 */
#define XML_SCHEMAS_TYPE_BLOCK_RESTRICTION    1 << 19
/**
 * XML_SCHEMAS_TYPE_ABSTRACT:
 *
 * the simple/complexType is abstract.
 */
#define XML_SCHEMAS_TYPE_ABSTRACT    1 << 20
/**
 * XML_SCHEMAS_TYPE_FACETSNEEDVALUE:
 *
 * indicates if the facets need a computed value
 */
#define XML_SCHEMAS_TYPE_FACETSNEEDVALUE    1 << 21
/**
 * XML_SCHEMAS_TYPE_INTERNAL_RESOLVED:
 *
 * indicates that the type was typefixed
 */
#define XML_SCHEMAS_TYPE_INTERNAL_RESOLVED    1 << 22
/**
 * XML_SCHEMAS_TYPE_INTERNAL_INVALID:
 *
 * indicates that the type is invalid
 */
#define XML_SCHEMAS_TYPE_INTERNAL_INVALID    1 << 23
/**
 * XML_SCHEMAS_TYPE_WHITESPACE_PRESERVE:
 *
 * a whitespace-facet value of "preserve"
 */
#define XML_SCHEMAS_TYPE_WHITESPACE_PRESERVE    1 << 24
/**
 * XML_SCHEMAS_TYPE_WHITESPACE_REPLACE:
 *
 * a whitespace-facet value of "replace"
 */
#define XML_SCHEMAS_TYPE_WHITESPACE_REPLACE    1 << 25
/**
 * XML_SCHEMAS_TYPE_WHITESPACE_COLLAPSE:
 *
 * a whitespace-facet value of "collapse"
 */
#define XML_SCHEMAS_TYPE_WHITESPACE_COLLAPSE    1 << 26
/**
 * XML_SCHEMAS_TYPE_HAS_FACETS:
 *
 * has facets
 */
#define XML_SCHEMAS_TYPE_HAS_FACETS    1 << 27
/**
 * XML_SCHEMAS_TYPE_NORMVALUENEEDED:
 *
 * indicates if the facets (pattern) need a normalized value
 */
#define XML_SCHEMAS_TYPE_NORMVALUENEEDED    1 << 28

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

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

/**
 * _xmlSchemaType:
 *
 * 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 */
    xmlSchemaAnnotPtr annot;
    xmlSchemaTypePtr subtypes;
    xmlSchemaAttributePtr attributes; /* Deprecated; not used */
    xmlNodePtr 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 */
    xmlSchemaTypePtr baseType; /* The base type component */
    xmlSchemaFacetPtr facets; /* Local facets */
    struct _xmlSchemaType *redef; /* Deprecated; not used */
    int recurse; /* Obsolete */
    xmlSchemaAttributeLinkPtr *attributeUses; /* Deprecated; not used */
    xmlSchemaWildcardPtr attributeWildcard;
    int builtInType; /* Type of built-in types. */
    xmlSchemaTypeLinkPtr memberTypes; /* member-types if a union type. */
    xmlSchemaFacetLinkPtr facetSet; /* All facets (incl. inherited) */
    const xmlChar *refPrefix; /* Deprecated; not used */
    xmlSchemaTypePtr contentTypeDef; /* Used for the simple content of complex types.
                                        Could we use @subtypes for this? */
    xmlRegexpPtr contModel; /* Holds the automaton of the content model */
    const xmlChar *targetNamespace;
    void *attrUses;
};

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

typedef struct _xmlSchemaElement xmlSchemaElement;
typedef xmlSchemaElement *xmlSchemaElementPtr;
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 */
    xmlSchemaAnnotPtr annot;
    xmlSchemaTypePtr subtypes; /* the type definition */
    xmlSchemaAttributePtr attributes;
    xmlNodePtr 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 */
    xmlRegexpPtr contModel; /* Obsolete for WXS, maybe used for RelaxNG */
    xmlSchemaContentType contentType;
    const xmlChar *refPrefix; /* Deprecated; not used */
    xmlSchemaValPtr defVal; /* The compiled value contraint. */
    void *idcs; /* The identity-constraint defs */
};

/*
 * XML_SCHEMAS_FACET_UNKNOWN:
 *
 * unknown facet handling
 */
#define XML_SCHEMAS_FACET_UNKNOWN        0
/*
 * XML_SCHEMAS_FACET_PRESERVE:
 *
 * preserve the type of the facet
 */
#define XML_SCHEMAS_FACET_PRESERVE        1
/*
 * XML_SCHEMAS_FACET_REPLACE:
 *
 * replace the type of the facet
 */
#define XML_SCHEMAS_FACET_REPLACE        2
/*
 * XML_SCHEMAS_FACET_COLLAPSE:
 *
 * 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 */
    xmlSchemaAnnotPtr annot;
    xmlNodePtr node;
    int fixed; /* XML_SCHEMAS_FACET_PRESERVE, etc. */
    int whitespace;
    xmlSchemaValPtr val; /* The compiled value */
    xmlRegexpPtr    regexp; /* The regex for patterns */
};

/**
 * A notation definition.
 */
typedef struct _xmlSchemaNotation xmlSchemaNotation;
typedef xmlSchemaNotation *xmlSchemaNotationPtr;
struct _xmlSchemaNotation {
    xmlSchemaTypeType type; /* The kind of type */
    const xmlChar *name;
    xmlSchemaAnnotPtr 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.
*/
/**
 * XML_SCHEMAS_QUALIF_ELEM:
 *
 * Reflects elementFormDefault == qualified in
 * an XML schema document.
 */
#define XML_SCHEMAS_QUALIF_ELEM                1 << 0
/**
 * XML_SCHEMAS_QUALIF_ATTR:
 *
 * Reflects attributeFormDefault == qualified in
 * an XML schema document.
 */
#define XML_SCHEMAS_QUALIF_ATTR            1 << 1
/**
 * XML_SCHEMAS_FINAL_DEFAULT_EXTENSION:
 *
 * the schema has "extension" in the set of finalDefault.
 */
#define XML_SCHEMAS_FINAL_DEFAULT_EXTENSION        1 << 2
/**
 * XML_SCHEMAS_FINAL_DEFAULT_RESTRICTION:
 *
 * the schema has "restriction" in the set of finalDefault.
 */
#define XML_SCHEMAS_FINAL_DEFAULT_RESTRICTION            1 << 3
/**
 * XML_SCHEMAS_FINAL_DEFAULT_LIST:
 *
 * the cshema has "list" in the set of finalDefault.
 */
#define XML_SCHEMAS_FINAL_DEFAULT_LIST            1 << 4
/**
 * XML_SCHEMAS_FINAL_DEFAULT_UNION:
 *
 * the schema has "union" in the set of finalDefault.
 */
#define XML_SCHEMAS_FINAL_DEFAULT_UNION            1 << 5
/**
 * XML_SCHEMAS_BLOCK_DEFAULT_EXTENSION:
 *
 * the schema has "extension" in the set of blockDefault.
 */
#define XML_SCHEMAS_BLOCK_DEFAULT_EXTENSION            1 << 6
/**
 * XML_SCHEMAS_BLOCK_DEFAULT_RESTRICTION:
 *
 * the schema has "restriction" in the set of blockDefault.
 */
#define XML_SCHEMAS_BLOCK_DEFAULT_RESTRICTION            1 << 7
/**
 * XML_SCHEMAS_BLOCK_DEFAULT_SUBSTITUTION:
 *
 * the schema has "substitution" in the set of blockDefault.
 */
#define XML_SCHEMAS_BLOCK_DEFAULT_SUBSTITUTION            1 << 8
/**
 * XML_SCHEMAS_INCLUDING_CONVERT_NS:
 *
 * the schema is currently including an other schema with
 * no target namespace.
 */
#define XML_SCHEMAS_INCLUDING_CONVERT_NS            1 << 9
/**
 * _xmlSchema:
 *
 * A Schemas definition
 */
struct _xmlSchema {
    const xmlChar *name; /* schema name */
    const xmlChar *targetNamespace; /* the target namespace */
    const xmlChar *version;
    const xmlChar *id; /* Obsolete */
    xmlDocPtr doc;
    xmlSchemaAnnotPtr annot;
    int flags;

xmlHashTablePtr typeDecl;
    xmlHashTablePtr attrDecl;
    xmlHashTablePtr attrgrpDecl;
    xmlHashTablePtr elemDecl;
    xmlHashTablePtr notaDecl;

xmlHashTablePtr schemasImports;

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

XMLPUBFUN void XMLCALL         xmlSchemaFreeType        (xmlSchemaTypePtr type);
XMLPUBFUN void XMLCALL         xmlSchemaFreeWildcard(xmlSchemaWildcardPtr wildcard);

#ifdef __cplusplus
}
#endif

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

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✏️ schemasInternals.h