xmlschemastypes: implementation of XML Schema Datatypes

## xmlschemastypes

xmlschemastypes - implementation of XML Schema Datatypes

module providing the XML Schema Datatypes implementation both definition and validity checking

Author(s): Daniel Veillard

## Synopsis

    typedef enum xmlSchemaWhitespaceValueType;
    int	xmlSchemaCheckFacet		(xmlSchemaFacetPtr facet,
    					 xmlSchemaTypePtr typeDecl,
    					 xmlSchemaParserCtxtPtr pctxt,
    					 const xmlChar * name);
    void	xmlSchemaCleanupTypes		(void);
    xmlChar *	xmlSchemaCollapseString	(const xmlChar * value);
    int	xmlSchemaCompareValues		(xmlSchemaValPtr x,
    					 xmlSchemaValPtr y);
    int	xmlSchemaCompareValuesWhtsp	(xmlSchemaValPtr x,
    					 xmlSchemaWhitespaceValueType xws,
    					 xmlSchemaValPtr y,
    					 xmlSchemaWhitespaceValueType yws);
    xmlSchemaValPtr	xmlSchemaCopyValue	(xmlSchemaValPtr val);
    void	xmlSchemaFreeFacet		(xmlSchemaFacetPtr facet);
    void	xmlSchemaFreeValue		(xmlSchemaValPtr value);
    xmlSchemaTypePtr	xmlSchemaGetBuiltInListSimpleTypeItemType	(xmlSchemaTypePtr type);
    xmlSchemaTypePtr	xmlSchemaGetBuiltInType	(xmlSchemaValType type);
    int	xmlSchemaGetCanonValue		(xmlSchemaValPtr val,
    					 const xmlChar ** retValue);
    int	xmlSchemaGetCanonValueWhtsp	(xmlSchemaValPtr val,
    					 const xmlChar ** retValue,
    					 xmlSchemaWhitespaceValueType ws);
    unsigned long	xmlSchemaGetFacetValueAsULong	(xmlSchemaFacetPtr facet);
    xmlSchemaTypePtr	xmlSchemaGetPredefinedType	(const xmlChar * name,
    							 const xmlChar * ns);
    xmlSchemaValType	xmlSchemaGetValType	(xmlSchemaValPtr val);
    void	xmlSchemaInitTypes		(void);
    int	xmlSchemaIsBuiltInTypeFacet	(xmlSchemaTypePtr type,
    					 int facetType);
    xmlSchemaFacetPtr	xmlSchemaNewFacet	(void);
    xmlSchemaValPtr	xmlSchemaNewNOTATIONValue	(const xmlChar * name,
    						 const xmlChar * ns);
    xmlSchemaValPtr	xmlSchemaNewQNameValue	(const xmlChar * namespaceName,
    					 const xmlChar * localName);
    xmlSchemaValPtr	xmlSchemaNewStringValue	(xmlSchemaValType type,
    					 const xmlChar * value);
    int	xmlSchemaValPredefTypeNode	(xmlSchemaTypePtr type,
    					 const xmlChar * value,
    					 xmlSchemaValPtr * val,
    					 xmlNodePtr node);
    int	xmlSchemaValPredefTypeNodeNoNorm	(xmlSchemaTypePtr type,
    						 const xmlChar * value,
    						 xmlSchemaValPtr * val,
    						 xmlNodePtr node);
    int	xmlSchemaValidateFacet		(xmlSchemaTypePtr base,
    					 xmlSchemaFacetPtr facet,
    					 const xmlChar * value,
    					 xmlSchemaValPtr val);
    int	xmlSchemaValidateFacetWhtsp	(xmlSchemaFacetPtr facet,
    					 xmlSchemaWhitespaceValueType fws,
    					 xmlSchemaValType valType,
    					 const xmlChar * value,
    					 xmlSchemaValPtr val,
    					 xmlSchemaWhitespaceValueType ws);
    int	xmlSchemaValidateLengthFacet	(xmlSchemaTypePtr type,
    					 xmlSchemaFacetPtr facet,
    					 const xmlChar * value,
    					 xmlSchemaValPtr val,
    					 unsigned long * length);
    int	xmlSchemaValidateLengthFacetWhtsp	(xmlSchemaFacetPtr facet,
    						 xmlSchemaValType valType,
    						 const xmlChar * value,
    						 xmlSchemaValPtr val,
    						 unsigned long * length,
    						 xmlSchemaWhitespaceValueType ws);
    int	xmlSchemaValidateListSimpleTypeFacet	(xmlSchemaFacetPtr facet,
    						 const xmlChar * value,
    						 unsigned long actualLen,
    						 unsigned long * expectedLen);
    int	xmlSchemaValidatePredefinedType	(xmlSchemaTypePtr type,
    					 const xmlChar * value,
    					 xmlSchemaValPtr * val);
    int	xmlSchemaValueAppend		(xmlSchemaValPtr prev,
    					 xmlSchemaValPtr cur);
    int	xmlSchemaValueGetAsBoolean	(xmlSchemaValPtr val);
    const xmlChar *	xmlSchemaValueGetAsString	(xmlSchemaValPtr val);
    xmlSchemaValPtr	xmlSchemaValueGetNext	(xmlSchemaValPtr cur);
    xmlChar *	xmlSchemaWhiteSpaceReplace	(const xmlChar * value);

## Description

## Details

### Enum xmlSchemaWhitespaceValueType

    enum xmlSchemaWhitespaceValueType {
        XML_SCHEMA_WHITESPACE_UNKNOWN = 0
        XML_SCHEMA_WHITESPACE_PRESERVE = 1
        XML_SCHEMA_WHITESPACE_REPLACE = 2
        XML_SCHEMA_WHITESPACE_COLLAPSE = 3
    };

### xmlSchemaCheckFacet ()

    int	xmlSchemaCheckFacet		(xmlSchemaFacetPtr facet,
    					 xmlSchemaTypePtr typeDecl,
    					 xmlSchemaParserCtxtPtr pctxt,
    					 const xmlChar * name)

Checks and computes the values of facets.

`facet`: | the facet
`typeDecl`: | the schema type definition
`pctxt`: | the schema parser context or NULL
`name`: | the optional name of the type
`Returns`: | 0 if valid, a positive error code if not valid and -1 in case of an internal or API error.

### xmlSchemaCleanupTypes ()

    void	xmlSchemaCleanupTypes		(void)

DEPRECATED: This function will be made private. Call xmlCleanupParser to free global state but see the warnings there. xmlCleanupParser should be only called once at program exit. In most cases, you don't have call cleanup functions at all. Cleanup the default XML Schemas type library

### xmlSchemaCollapseString ()

    xmlChar *	xmlSchemaCollapseString	(const xmlChar * value)

Removes and normalize white spaces in the string

`value`: | a value
`Returns`: | the new string or NULL if no change was required.

### xmlSchemaCompareValues ()

    int	xmlSchemaCompareValues		(xmlSchemaValPtr x,
    					 xmlSchemaValPtr y)

Compare 2 values

`x`: | a first value
`y`: | a second value
`Returns`: | -1 if x < y, 0 if x == y, 1 if x > y, 2 if x <> y, and -2 in case of error

### xmlSchemaCompareValuesWhtsp ()

    int	xmlSchemaCompareValuesWhtsp	(xmlSchemaValPtr x,
    					 xmlSchemaWhitespaceValueType xws,
    					 xmlSchemaValPtr y,
    					 xmlSchemaWhitespaceValueType yws)

Compare 2 values

`x`: | a first value
`xws`: | the whitespace value of x
`y`: | a second value
`yws`: | the whitespace value of y
`Returns`: | -1 if x < y, 0 if x == y, 1 if x > y, 2 if x <> y, and -2 in case of error

### xmlSchemaCopyValue ()

    xmlSchemaValPtr	xmlSchemaCopyValue	(xmlSchemaValPtr val)

Copies the precomputed value. This duplicates any string within.

`val`: | the precomputed value to be copied
`Returns`: | the copy or NULL if a copy for a data-type is not implemented.

### xmlSchemaFreeFacet ()

    void	xmlSchemaFreeFacet		(xmlSchemaFacetPtr facet)

Deallocate a Schema Facet structure.

`facet`: | a schema facet structure

### xmlSchemaFreeValue ()

    void	xmlSchemaFreeValue		(xmlSchemaValPtr value)

Cleanup the default XML Schemas type library

`value`: | the value to free

### xmlSchemaGetBuiltInListSimpleTypeItemType ()

    xmlSchemaTypePtr	xmlSchemaGetBuiltInListSimpleTypeItemType	(xmlSchemaTypePtr type)

Lookup function

`type`: | the built-in simple type.
`Returns`: | the item type of @type as defined by the built-in datatype hierarchy of XML Schema Part 2: Datatypes, or NULL in case of an error.

### xmlSchemaGetBuiltInType ()

    xmlSchemaTypePtr	xmlSchemaGetBuiltInType	(xmlSchemaValType type)

Gives you the type struct for a built-in type by its type id.

`type`: | the type of the built in type
`Returns`: | the type if found, NULL otherwise.

### xmlSchemaGetCanonValue ()

    int	xmlSchemaGetCanonValue		(xmlSchemaValPtr val,
    					 const xmlChar ** retValue)

Get the canonical lexical representation of the value. The caller has to FREE the returned retValue. WARNING: Some value types are not supported yet, resulting in a @retValue of "???". TODO: XML Schema 1.0 does not define canonical representations for: duration, gYearMonth, gYear, gMonthDay, gMonth, gDay, anyURI, QName, NOTATION. This will be fixed in XML Schema 1.1.

`val`: | the precomputed value
`retValue`: | the returned value
`Returns`: | 0 if the value could be built, 1 if the value type is not supported yet and -1 in case of API errors.

### xmlSchemaGetCanonValueWhtsp ()

    int	xmlSchemaGetCanonValueWhtsp	(xmlSchemaValPtr val,
    					 const xmlChar ** retValue,
    					 xmlSchemaWhitespaceValueType ws)

Get the canonical representation of the value. The caller has to free the returned @retValue.

`val`: | the precomputed value
`retValue`: | the returned value
`ws`: | the whitespace type of the value
`Returns`: | 0 if the value could be built, 1 if the value type is not supported yet and -1 in case of API errors.

### xmlSchemaGetFacetValueAsULong ()

    unsigned long	xmlSchemaGetFacetValueAsULong	(xmlSchemaFacetPtr facet)

Extract the value of a facet

`facet`: | an schemas type facet
`Returns`: | the value as a long

### xmlSchemaGetPredefinedType ()

    xmlSchemaTypePtr	xmlSchemaGetPredefinedType	(const xmlChar * name,
    							 const xmlChar * ns)

Lookup a type in the default XML Schemas type library

`name`: | the type name
`ns`: | the URI of the namespace usually "http://www.w3.org/2001/XMLSchema"
`Returns`: | the type if found, NULL otherwise

### xmlSchemaGetValType ()

    xmlSchemaValType	xmlSchemaGetValType	(xmlSchemaValPtr val)

Accessor for the type of a value

`val`: | a schemas value
`Returns`: | the xmlSchemaValType of the value

### xmlSchemaInitTypes ()

    void	xmlSchemaInitTypes		(void)

Initialize the default XML Schemas type library

### xmlSchemaIsBuiltInTypeFacet ()

    int	xmlSchemaIsBuiltInTypeFacet	(xmlSchemaTypePtr type,
    					 int facetType)

Evaluates if a specific facet can be used in conjunction with a type.

`type`: | the built-in type
`facetType`: | the facet type
`Returns`: | 1 if the facet can be used with the given built-in type, 0 otherwise and -1 in case the type is not a built-in type.

### xmlSchemaNewFacet ()

    xmlSchemaFacetPtr	xmlSchemaNewFacet	(void)

Allocate a new Facet structure.

`Returns`: | the newly allocated structure or NULL in case or error

### xmlSchemaNewNOTATIONValue ()

    xmlSchemaValPtr	xmlSchemaNewNOTATIONValue	(const xmlChar * name,
    						 const xmlChar * ns)

Allocate a new NOTATION value. The given values are consumed and freed with the struct.

`name`: | the notation name
`ns`: | the notation namespace name or NULL
`Returns`: | a pointer to the new value or NULL in case of error

### xmlSchemaNewQNameValue ()

    xmlSchemaValPtr	xmlSchemaNewQNameValue	(const xmlChar * namespaceName,
    					 const xmlChar * localName)

Allocate a new QName value. The given values are consumed and freed with the struct.

`namespaceName`: | the namespace name
`localName`: | the local name
`Returns`: | a pointer to the new value or NULL in case of an error.

### xmlSchemaNewStringValue ()

    xmlSchemaValPtr	xmlSchemaNewStringValue	(xmlSchemaValType type,
    					 const xmlChar * value)

Allocate a new simple type value. The type can be of XML_SCHEMAS_STRING. WARNING: This one is intended to be expanded for other string based types. We need this for anySimpleType as well. The given value is consumed and freed with the struct.

`type`: | the value type
`value`: | the value
`Returns`: | a pointer to the new value or NULL in case of error

### xmlSchemaValPredefTypeNode ()

    int	xmlSchemaValPredefTypeNode	(xmlSchemaTypePtr type,
    					 const xmlChar * value,
    					 xmlSchemaValPtr * val,
    					 xmlNodePtr node)

Check that a value conforms to the lexical space of the predefined type. if true a value is computed and returned in @val.

`type`: | the predefined type
`value`: | the value to check
`val`: | the return computed value
`node`: | the node containing the value
`Returns`: | 0 if this validates, a positive error code number otherwise and -1 in case of internal or API error.

### xmlSchemaValPredefTypeNodeNoNorm ()

    int	xmlSchemaValPredefTypeNodeNoNorm	(xmlSchemaTypePtr type,
    						 const xmlChar * value,
    						 xmlSchemaValPtr * val,
    						 xmlNodePtr node)

Check that a value conforms to the lexical space of the predefined type. if true a value is computed and returned in @val. This one does apply any normalization to the value.

`type`: | the predefined type
`value`: | the value to check
`val`: | the return computed value
`node`: | the node containing the value
`Returns`: | 0 if this validates, a positive error code number otherwise and -1 in case of internal or API error.

### xmlSchemaValidateFacet ()

    int	xmlSchemaValidateFacet		(xmlSchemaTypePtr base,
    					 xmlSchemaFacetPtr facet,
    					 const xmlChar * value,
    					 xmlSchemaValPtr val)

Check a value against a facet condition

`base`: | the base type
`facet`: | the facet to check
`value`: | the lexical repr of the value to validate
`val`: | the precomputed value
`Returns`: | 0 if the element is schemas valid, a positive error code number otherwise and -1 in case of internal or API error.

### xmlSchemaValidateFacetWhtsp ()

    int	xmlSchemaValidateFacetWhtsp	(xmlSchemaFacetPtr facet,
    					 xmlSchemaWhitespaceValueType fws,
    					 xmlSchemaValType valType,
    					 const xmlChar * value,
    					 xmlSchemaValPtr val,
    					 xmlSchemaWhitespaceValueType ws)

Check a value against a facet condition. This takes value normalization according to the specified whitespace types into account. Note that @value needs to be the *normalized* value if the facet is of type "pattern".

`facet`: | the facet to check
`fws`: | the whitespace type of the facet's value
`valType`: | the built-in type of the value
`value`: | the lexical (or normalized for pattern) repr of the value to validate
`val`: | the precomputed value
`ws`: | the whitespace type of the value
`Returns`: | 0 if the element is schemas valid, a positive error code number otherwise and -1 in case of internal or API error.

### xmlSchemaValidateLengthFacet ()

    int	xmlSchemaValidateLengthFacet	(xmlSchemaTypePtr type,
    					 xmlSchemaFacetPtr facet,
    					 const xmlChar * value,
    					 xmlSchemaValPtr val,
    					 unsigned long * length)

Checka a value against a "length", "minLength" and "maxLength" facet; sets @length to the computed length of @value.

`type`: | the built-in type
`facet`: | the facet to check
`value`: | the lexical repr. of the value to be validated
`val`: | the precomputed value
`length`: | the actual length of the value
`Returns`: | 0 if the value is valid, a positive error code otherwise and -1 in case of an internal or API error.

### xmlSchemaValidateLengthFacetWhtsp ()

    int	xmlSchemaValidateLengthFacetWhtsp	(xmlSchemaFacetPtr facet,
    						 xmlSchemaValType valType,
    						 const xmlChar * value,
    						 xmlSchemaValPtr val,
    						 unsigned long * length,
    						 xmlSchemaWhitespaceValueType ws)

Checka a value against a "length", "minLength" and "maxLength" facet; sets @length to the computed length of @value.

`facet`: | the facet to check
`valType`: | the built-in type
`value`: | the lexical repr. of the value to be validated
`val`: | the precomputed value
`length`: | the actual length of the value
`ws`: | the whitespace type of the value
`Returns`: | 0 if the value is valid, a positive error code otherwise and -1 in case of an internal or API error.

### xmlSchemaValidateListSimpleTypeFacet ()

    int	xmlSchemaValidateListSimpleTypeFacet	(xmlSchemaFacetPtr facet,
    						 const xmlChar * value,
    						 unsigned long actualLen,
    						 unsigned long * expectedLen)

Checks the value of a list simple type against a facet.

`facet`: | the facet to check
`value`: | the lexical repr of the value to validate
`actualLen`: | the number of list items
`expectedLen`: | the resulting expected number of list items
`Returns`: | 0 if the value is valid, a positive error code number otherwise and -1 in case of an internal error.

### xmlSchemaValidatePredefinedType ()

    int	xmlSchemaValidatePredefinedType	(xmlSchemaTypePtr type,
    					 const xmlChar * value,
    					 xmlSchemaValPtr * val)

Check that a value conforms to the lexical space of the predefined type. if true a value is computed and returned in @val.

`type`: | the predefined type
`value`: | the value to check
`val`: | the return computed value
`Returns`: | 0 if this validates, a positive error code number otherwise and -1 in case of internal or API error.

### xmlSchemaValueAppend ()

    int	xmlSchemaValueAppend		(xmlSchemaValPtr prev,
    					 xmlSchemaValPtr cur)

Appends a next sibling to a list of computed values.

`prev`: | the value
`cur`: | the value to be appended
`Returns`: | 0 if succeeded and -1 on API errors.

### xmlSchemaValueGetAsBoolean ()

    int	xmlSchemaValueGetAsBoolean	(xmlSchemaValPtr val)

Accessor for the boolean value of a computed value.

`val`: | the value
`Returns`: | 1 if true and 0 if false, or in case of an error. Hmm.

### xmlSchemaValueGetAsString ()

    const xmlChar *	xmlSchemaValueGetAsString	(xmlSchemaValPtr val)

Accessor for the string value of a computed value.

`val`: | the value
`Returns`: | the string value or NULL if there was none, or on API errors.

### xmlSchemaValueGetNext ()

    xmlSchemaValPtr	xmlSchemaValueGetNext	(xmlSchemaValPtr cur)

Accessor for the next sibling of a list of computed values.

`cur`: | the value
`Returns`: | the next value or NULL if there was none, or on API errors.

### xmlSchemaWhiteSpaceReplace ()

    xmlChar *	xmlSchemaWhiteSpaceReplace	(const xmlChar * value)

Replaces 0xd, 0x9 and 0xa with a space.

`value`: | a value
`Returns`: | the new string or NULL if no change was required.