## valid

valid —

## Synopsis

    struct      xmlValidState;
    typedef     xmlValidStatePtr;
    void        (*xmlValidityErrorFunc)         (void *ctx,
                                                 const char *msg,
                                                 ...);
    void        (*xmlValidityWarningFunc)       (void *ctx,
                                                 const char *msg,
                                                 ...);
    struct      xmlValidCtxt;
    typedef     xmlValidCtxtPtr;
    typedef     xmlNotationTablePtr;
    typedef     xmlElementTablePtr;
    typedef     xmlAttributeTablePtr;
    typedef     xmlIDTablePtr;
    typedef     xmlRefTablePtr;
    xmlValidCtxtPtr xmlNewValidCtxt             (void);
    void        xmlFreeValidCtxt                (xmlValidCtxtPtr);
    xmlNotationPtr xmlAddNotationDecl           (xmlValidCtxtPtr ctxt,
                                                 xmlDtdPtr dtd,
                                                 const xmlChar *name,
                                                 const xmlChar *PublicID,
                                                 const xmlChar *SystemID);
    xmlNotationTablePtr xmlCopyNotationTable    (xmlNotationTablePtr table);
    void        xmlFreeNotationTable            (xmlNotationTablePtr table);
    void        xmlDumpNotationDecl             (xmlBufferPtr buf,
                                                 xmlNotationPtr nota);
    void        xmlDumpNotationTable            (xmlBufferPtr buf,
                                                 xmlNotationTablePtr table);
    xmlElementContentPtr xmlNewElementContent   (const xmlChar *name,
                                                 xmlElementContentType type);
    xmlElementContentPtr xmlCopyElementContent  (xmlElementContentPtr content);
    void        xmlFreeElementContent           (xmlElementContentPtr cur);
    void        xmlSnprintfElementContent       (char *buf,
                                                 int size,
                                                 xmlElementContentPtr content,
                                                 int glob);
    void        xmlSprintfElementContent        (char *buf,
                                                 xmlElementContentPtr content,
                                                 int glob);
    xmlElementPtr xmlAddElementDecl             (xmlValidCtxtPtr ctxt,
                                                 xmlDtdPtr dtd,
                                                 const xmlChar *name,
                                                 xmlElementTypeVal type,
                                                 xmlElementContentPtr content);
    xmlElementTablePtr xmlCopyElementTable      (xmlElementTablePtr table);
    void        xmlFreeElementTable             (xmlElementTablePtr table);
    void        xmlDumpElementTable             (xmlBufferPtr buf,
                                                 xmlElementTablePtr table);
    void        xmlDumpElementDecl              (xmlBufferPtr buf,
                                                 xmlElementPtr elem);
    xmlEnumerationPtr xmlCreateEnumeration      (const xmlChar *name);
    void        xmlFreeEnumeration              (xmlEnumerationPtr cur);
    xmlEnumerationPtr xmlCopyEnumeration        (xmlEnumerationPtr cur);
    xmlAttributePtr xmlAddAttributeDecl         (xmlValidCtxtPtr ctxt,
                                                 xmlDtdPtr dtd,
                                                 const xmlChar *elem,
                                                 const xmlChar *name,
                                                 const xmlChar *ns,
                                                 xmlAttributeType type,
                                                 xmlAttributeDefault def,
                                                 const xmlChar *defaultValue,
                                                 xmlEnumerationPtr tree);
    xmlAttributeTablePtr xmlCopyAttributeTable  (xmlAttributeTablePtr table);
    void        xmlFreeAttributeTable           (xmlAttributeTablePtr table);
    void        xmlDumpAttributeTable           (xmlBufferPtr buf,
                                                 xmlAttributeTablePtr table);
    void        xmlDumpAttributeDecl            (xmlBufferPtr buf,
                                                 xmlAttributePtr attr);
    xmlIDPtr    xmlAddID                        (xmlValidCtxtPtr ctxt,
                                                 xmlDocPtr doc,
                                                 const xmlChar *value,
                                                 xmlAttrPtr attr);
    void        xmlFreeIDTable                  (xmlIDTablePtr table);
    xmlAttrPtr  xmlGetID                        (xmlDocPtr doc,
                                                 const xmlChar *ID);
    int         xmlIsID                         (xmlDocPtr doc,
                                                 xmlNodePtr elem,
                                                 xmlAttrPtr attr);
    int         xmlRemoveID                     (xmlDocPtr doc,
                                                 xmlAttrPtr attr);
    xmlRefPtr   xmlAddRef                       (xmlValidCtxtPtr ctxt,
                                                 xmlDocPtr doc,
                                                 const xmlChar *value,
                                                 xmlAttrPtr attr);
    void        xmlFreeRefTable                 (xmlRefTablePtr table);
    int         xmlIsRef                        (xmlDocPtr doc,
                                                 xmlNodePtr elem,
                                                 xmlAttrPtr attr);
    int         xmlRemoveRef                    (xmlDocPtr doc,
                                                 xmlAttrPtr attr);
    xmlListPtr  xmlGetRefs                      (xmlDocPtr doc,
                                                 const xmlChar *ID);
    int         xmlValidateRoot                 (xmlValidCtxtPtr ctxt,
                                                 xmlDocPtr doc);
    int         xmlValidateElementDecl          (xmlValidCtxtPtr ctxt,
                                                 xmlDocPtr doc,
                                                 xmlElementPtr elem);
    xmlChar*    xmlValidNormalizeAttributeValue (xmlDocPtr doc,
                                                 xmlNodePtr elem,
                                                 const xmlChar *name,
                                                 const xmlChar *value);
    xmlChar*    xmlValidCtxtNormalizeAttributeValue
                                                (xmlValidCtxtPtr ctxt,
                                                 xmlDocPtr doc,
                                                 xmlNodePtr elem,
                                                 const xmlChar *name,
                                                 const xmlChar *value);
    int         xmlValidateAttributeDecl        (xmlValidCtxtPtr ctxt,
                                                 xmlDocPtr doc,
                                                 xmlAttributePtr attr);
    int         xmlValidateAttributeValue       (xmlAttributeType type,
                                                 const xmlChar *value);
    int         xmlValidateNotationDecl         (xmlValidCtxtPtr ctxt,
                                                 xmlDocPtr doc,
                                                 xmlNotationPtr nota);
    int         xmlValidateDtd                  (xmlValidCtxtPtr ctxt,
                                                 xmlDocPtr doc,
                                                 xmlDtdPtr dtd);
    int         xmlValidateDtdFinal             (xmlValidCtxtPtr ctxt,
                                                 xmlDocPtr doc);
    int         xmlValidateDocument             (xmlValidCtxtPtr ctxt,
                                                 xmlDocPtr doc);
    int         xmlValidateElement              (xmlValidCtxtPtr ctxt,
                                                 xmlDocPtr doc,
                                                 xmlNodePtr elem);
    int         xmlValidateOneElement           (xmlValidCtxtPtr ctxt,
                                                 xmlDocPtr doc,
                                                 xmlNodePtr elem);
    int         xmlValidateOneAttribute         (xmlValidCtxtPtr ctxt,
                                                 xmlDocPtr doc,
                                                 xmlNodePtr elem,
                                                 xmlAttrPtr attr,
                                                 const xmlChar *value);
    int         xmlValidateOneNamespace         (xmlValidCtxtPtr ctxt,
                                                 xmlDocPtr doc,
                                                 xmlNodePtr elem,
                                                 const xmlChar *prefix,
                                                 xmlNsPtr ns,
                                                 const xmlChar *value);
    int         xmlValidateDocumentFinal        (xmlValidCtxtPtr ctxt,
                                                 xmlDocPtr doc);
    int         xmlValidateNotationUse          (xmlValidCtxtPtr ctxt,
                                                 xmlDocPtr doc,
                                                 const xmlChar *notationName);
    int         xmlIsMixedElement               (xmlDocPtr doc,
                                                 const xmlChar *name);
    xmlAttributePtr xmlGetDtdAttrDesc           (xmlDtdPtr dtd,
                                                 const xmlChar *elem,
                                                 const xmlChar *name);
    xmlAttributePtr xmlGetDtdQAttrDesc          (xmlDtdPtr dtd,
                                                 const xmlChar *elem,
                                                 const xmlChar *name,
                                                 const xmlChar *prefix);
    xmlNotationPtr xmlGetDtdNotationDesc        (xmlDtdPtr dtd,
                                                 const xmlChar *name);
    xmlElementPtr xmlGetDtdQElementDesc         (xmlDtdPtr dtd,
                                                 const xmlChar *name,
                                                 const xmlChar *prefix);
    xmlElementPtr xmlGetDtdElementDesc          (xmlDtdPtr dtd,
                                                 const xmlChar *name);
    int         xmlValidGetValidElements        (xmlNode *prev,
                                                 xmlNode *next,
                                                 const xmlChar **list,
                                                 int max);
    int         xmlValidGetPotentialChildren    (xmlElementContent *ctree,
                                                 const xmlChar **list,
                                                 int *len,
                                                 int max);
    int         xmlValidateNameValue            (const xmlChar *value);
    int         xmlValidateNamesValue           (const xmlChar *value);
    int         xmlValidateNmtokenValue         (const xmlChar *value);
    int         xmlValidateNmtokensValue        (const xmlChar *value);
    int         xmlValidBuildContentModel       (xmlValidCtxtPtr ctxt,
                                                 xmlElementPtr elem);
    int         xmlValidatePushElement          (xmlValidCtxtPtr ctxt,
                                                 xmlDocPtr doc,
                                                 xmlNodePtr elem,
                                                 const xmlChar *qname);
    int         xmlValidatePushCData            (xmlValidCtxtPtr ctxt,
                                                 const xmlChar *data,
                                                 int len);
    int         xmlValidatePopElement           (xmlValidCtxtPtr ctxt,
                                                 xmlDocPtr doc,
                                                 xmlNodePtr elem,
                                                 const xmlChar *qname);

## Description

## Details

### struct xmlValidState

    struct xmlValidState;

### xmlValidStatePtr

    typedef xmlValidState *xmlValidStatePtr;

### xmlValidityErrorFunc ()

    void        (*xmlValidityErrorFunc)         (void *ctx,
                                                 const char *msg,
                                                 ...);

Callback called when a validity error is found. This is a message oriented function similar to an *printf function.

`ctx` : | an xmlValidCtxtPtr validity error context
`msg` : | the string to format *printf like vararg
`...` : | remaining arguments to the format

### xmlValidityWarningFunc ()

    void        (*xmlValidityWarningFunc)       (void *ctx,
                                                 const char *msg,
                                                 ...);

Callback called when a validity warning is found. This is a message oriented function similar to an *printf function.

`ctx` : | an xmlValidCtxtPtr validity error context
`msg` : | the string to format *printf like vararg
`...` : | remaining arguments to the format

### struct xmlValidCtxt

    struct xmlValidCtxt {
        void *userData;			/* user specific data block */
        xmlValidityErrorFunc error;		/* the callback in case of errors */
        xmlValidityWarningFunc warning;	/* the callback in case of warning */

        /* Node analysis stack used when validating within entities */
        xmlNodePtr         node;          /* Current parsed Node */
        int                nodeNr;        /* Depth of the parsing stack */
        int                nodeMax;       /* Max depth of the parsing stack */
        xmlNodePtr        *nodeTab;       /* array of nodes */

        int              finishDtd;       /* finished validating the Dtd ? */
        xmlDocPtr              doc;       /* the document */
        int                  valid;       /* temporary validity check result */

        /* state state used for non-determinist content validation */
        xmlValidState     *vstate;        /* current state */
        int                vstateNr;      /* Depth of the validation stack */
        int                vstateMax;     /* Max depth of the validation stack */
        xmlValidState     *vstateTab;     /* array of validation states */

    #ifdef LIBXML_REGEXP_ENABLED
        xmlAutomataPtr            am;     /* the automata */
        xmlAutomataStatePtr    state;     /* used to build the automata */
    #else
        void                     *am;
        void                  *state;
    #endif
    };

### xmlValidCtxtPtr

    typedef xmlValidCtxt *xmlValidCtxtPtr;

### xmlNotationTablePtr

    typedef xmlNotationTable *xmlNotationTablePtr;

### xmlElementTablePtr

    typedef xmlElementTable *xmlElementTablePtr;

### xmlAttributeTablePtr

    typedef xmlAttributeTable *xmlAttributeTablePtr;

### xmlIDTablePtr

    typedef xmlIDTable *xmlIDTablePtr;

### xmlRefTablePtr

    typedef xmlRefTable *xmlRefTablePtr;

### xmlNewValidCtxt ()

    xmlValidCtxtPtr xmlNewValidCtxt             (void);

Allocate a validation context structure.

Returns : | NULL if not, otherwise the new validation context structure

### xmlFreeValidCtxt ()

    void        xmlFreeValidCtxt                (xmlValidCtxtPtr);

Free a validation context structure.

`Param1` : |

### xmlAddNotationDecl ()

    xmlNotationPtr xmlAddNotationDecl           (xmlValidCtxtPtr ctxt,
                                                 xmlDtdPtr dtd,
                                                 const xmlChar *name,
                                                 const xmlChar *PublicID,
                                                 const xmlChar *SystemID);

Register a new notation declaration

`ctxt` : | the validation context
`dtd` : | pointer to the DTD
`name` : | the entity name
`PublicID` : | the public identifier or NULL
`SystemID` : | the system identifier or NULL
Returns : | NULL if not, otherwise the entity

### xmlCopyNotationTable ()

    xmlNotationTablePtr xmlCopyNotationTable    (xmlNotationTablePtr table);

Build a copy of a notation table.

`table` : | A notation table
Returns : | the new xmlNotationTablePtr or NULL in case of error.

### xmlFreeNotationTable ()

    void        xmlFreeNotationTable            (xmlNotationTablePtr table);

Deallocate the memory used by an entities hash table.

`table` : | An notation table

### xmlDumpNotationDecl ()

    void        xmlDumpNotationDecl             (xmlBufferPtr buf,
                                                 xmlNotationPtr nota);

This will dump the content the notation declaration as an XML DTD definition

`buf` : | the XML buffer output
`nota` : | A notation declaration

### xmlDumpNotationTable ()

    void        xmlDumpNotationTable            (xmlBufferPtr buf,
                                                 xmlNotationTablePtr table);

This will dump the content of the notation table as an XML DTD definition

`buf` : | the XML buffer output
`table` : | A notation table

### xmlNewElementContent ()

    xmlElementContentPtr xmlNewElementContent   (const xmlChar *name,
                                                 xmlElementContentType type);

Allocate an element content structure.

`name` : | the subelement name or NULL
`type` : | the type of element content decl
Returns : | NULL if not, otherwise the new element content structure

### xmlCopyElementContent ()

    xmlElementContentPtr xmlCopyElementContent  (xmlElementContentPtr content);

Build a copy of an element content description.

`content` : |
Returns : | the new xmlElementContentPtr or NULL in case of error.

### xmlFreeElementContent ()

    void        xmlFreeElementContent           (xmlElementContentPtr cur);

Free an element content structure. This is a recursive call !

`cur` : | the element content tree to free

### xmlSnprintfElementContent ()

    void        xmlSnprintfElementContent       (char *buf,
                                                 int size,
                                                 xmlElementContentPtr content,
                                                 int glob);

This will dump the content of the element content definition Intended just for the debug routine

`buf` : | an output buffer
`size` : | the buffer size
`content` : | An element table
`glob` : | 1 if one must print the englobing parenthesis, 0 otherwise

### xmlSprintfElementContent ()

    void        xmlSprintfElementContent        (char *buf,
                                                 xmlElementContentPtr content,
                                                 int glob);

Deprecated, unsafe, use xmlSnprintfElementContent

`buf` : | an output buffer
`content` : | An element table
`glob` : | 1 if one must print the englobing parenthesis, 0 otherwise

### xmlAddElementDecl ()

    xmlElementPtr xmlAddElementDecl             (xmlValidCtxtPtr ctxt,
                                                 xmlDtdPtr dtd,
                                                 const xmlChar *name,
                                                 xmlElementTypeVal type,
                                                 xmlElementContentPtr content);

Register a new element declaration

`ctxt` : | the validation context
`dtd` : | pointer to the DTD
`name` : | the entity name
`type` : | the element type
`content` : | the element content tree or NULL
Returns : | NULL if not, otherwise the entity

### xmlCopyElementTable ()

    xmlElementTablePtr xmlCopyElementTable      (xmlElementTablePtr table);

Build a copy of an element table.

`table` : | An element table
Returns : | the new xmlElementTablePtr or NULL in case of error.

### xmlFreeElementTable ()

    void        xmlFreeElementTable             (xmlElementTablePtr table);

Deallocate the memory used by an element hash table.

`table` : | An element table

### xmlDumpElementTable ()

    void        xmlDumpElementTable             (xmlBufferPtr buf,
                                                 xmlElementTablePtr table);

This will dump the content of the element table as an XML DTD definition

`buf` : | the XML buffer output
`table` : | An element table

### xmlDumpElementDecl ()

    void        xmlDumpElementDecl              (xmlBufferPtr buf,
                                                 xmlElementPtr elem);

This will dump the content of the element declaration as an XML DTD definition

`buf` : | the XML buffer output
`elem` : | An element table

### xmlCreateEnumeration ()

    xmlEnumerationPtr xmlCreateEnumeration      (const xmlChar *name);

create and initialize an enumeration attribute node.

`name` : | the enumeration name or NULL
Returns : | the xmlEnumerationPtr just created or NULL in case of error.

### xmlFreeEnumeration ()

    void        xmlFreeEnumeration              (xmlEnumerationPtr cur);

free an enumeration attribute node (recursive).

`cur` : | the tree to free.

### xmlCopyEnumeration ()

    xmlEnumerationPtr xmlCopyEnumeration        (xmlEnumerationPtr cur);

Copy an enumeration attribute node (recursive).

`cur` : | the tree to copy.
Returns : | the xmlEnumerationPtr just created or NULL in case of error.

### xmlAddAttributeDecl ()

    xmlAttributePtr xmlAddAttributeDecl         (xmlValidCtxtPtr ctxt,
                                                 xmlDtdPtr dtd,
                                                 const xmlChar *elem,
                                                 const xmlChar *name,
                                                 const xmlChar *ns,
                                                 xmlAttributeType type,
                                                 xmlAttributeDefault def,
                                                 const xmlChar *defaultValue,
                                                 xmlEnumerationPtr tree);

Register a new attribute declaration Note that `tree` becomes the ownership of the DTD

`ctxt` : | the validation context
`dtd` : | pointer to the DTD
`elem` : | the element name
`name` : | the attribute name
`ns` : | the attribute namespace prefix
`type` : | the attribute type
`def` : | the attribute default type
`defaultValue` : | the attribute default value
`tree` : | if it's an enumeration, the associated list
Returns : | NULL if not new, otherwise the attribute decl

### xmlCopyAttributeTable ()

    xmlAttributeTablePtr xmlCopyAttributeTable  (xmlAttributeTablePtr table);

Build a copy of an attribute table.

`table` : | An attribute table
Returns : | the new xmlAttributeTablePtr or NULL in case of error.

### xmlFreeAttributeTable ()

    void        xmlFreeAttributeTable           (xmlAttributeTablePtr table);

Deallocate the memory used by an entities hash table.

`table` : | An attribute table

### xmlDumpAttributeTable ()

    void        xmlDumpAttributeTable           (xmlBufferPtr buf,
                                                 xmlAttributeTablePtr table);

This will dump the content of the attribute table as an XML DTD definition

`buf` : | the XML buffer output
`table` : | An attribute table

### xmlDumpAttributeDecl ()

    void        xmlDumpAttributeDecl            (xmlBufferPtr buf,
                                                 xmlAttributePtr attr);

This will dump the content of the attribute declaration as an XML DTD definition

`buf` : | the XML buffer output
`attr` : | An attribute declaration

### xmlAddID ()

    xmlIDPtr    xmlAddID                        (xmlValidCtxtPtr ctxt,
                                                 xmlDocPtr doc,
                                                 const xmlChar *value,
                                                 xmlAttrPtr attr);

Register a new id declaration

`ctxt` : | the validation context
`doc` : | pointer to the document
`value` : | the value name
`attr` : | the attribute holding the ID
Returns : | NULL if not, otherwise the new xmlIDPtr

### xmlFreeIDTable ()

    void        xmlFreeIDTable                  (xmlIDTablePtr table);

Deallocate the memory used by an ID hash table.

`table` : | An id table

### xmlGetID ()

    xmlAttrPtr  xmlGetID                        (xmlDocPtr doc,
                                                 const xmlChar *ID);

Search the attribute declaring the given ID

`doc` : | pointer to the document
`ID` : | the ID value
Returns : | NULL if not found, otherwise the xmlAttrPtr defining the ID

### xmlIsID ()

    int         xmlIsID                         (xmlDocPtr doc,
                                                 xmlNodePtr elem,
                                                 xmlAttrPtr attr);

Determine whether an attribute is of type ID. In case we have DTD(s) then this is done if DTD loading has been requested. In the case of HTML documents parsed with the HTML parser, then ID detection is done systematically.

`doc` : | the document
`elem` : | the element carrying the attribute
`attr` : | the attribute
Returns : | 0 or 1 depending on the lookup result

### xmlRemoveID ()

    int         xmlRemoveID                     (xmlDocPtr doc,
                                                 xmlAttrPtr attr);

Remove the given attribute from the ID table maintained internally.

`doc` : | the document
`attr` : | the attribute
Returns : | -1 if the lookup failed and 0 otherwise

### xmlAddRef ()

    xmlRefPtr   xmlAddRef                       (xmlValidCtxtPtr ctxt,
                                                 xmlDocPtr doc,
                                                 const xmlChar *value,
                                                 xmlAttrPtr attr);

Register a new ref declaration

`ctxt` : | the validation context
`doc` : | pointer to the document
`value` : | the value name
`attr` : | the attribute holding the Ref
Returns : | NULL if not, otherwise the new xmlRefPtr

### xmlFreeRefTable ()

    void        xmlFreeRefTable                 (xmlRefTablePtr table);

Deallocate the memory used by an Ref hash table.

`table` : | An ref table

### xmlIsRef ()

    int         xmlIsRef                        (xmlDocPtr doc,
                                                 xmlNodePtr elem,
                                                 xmlAttrPtr attr);

Determine whether an attribute is of type Ref. In case we have DTD(s) then this is simple, otherwise we use an heuristic: name Ref (upper or lowercase).

`doc` : | the document
`elem` : | the element carrying the attribute
`attr` : | the attribute
Returns : | 0 or 1 depending on the lookup result

### xmlRemoveRef ()

    int         xmlRemoveRef                    (xmlDocPtr doc,
                                                 xmlAttrPtr attr);

Remove the given attribute from the Ref table maintained internally.

`doc` : | the document
`attr` : | the attribute
Returns : | -1 if the lookup failed and 0 otherwise

### xmlGetRefs ()

    xmlListPtr  xmlGetRefs                      (xmlDocPtr doc,
                                                 const xmlChar *ID);

Find the set of references for the supplied ID.

`doc` : | pointer to the document
`ID` : | the ID value
Returns : | NULL if not found, otherwise node set for the ID.

### xmlValidateRoot ()

    int         xmlValidateRoot                 (xmlValidCtxtPtr ctxt,
                                                 xmlDocPtr doc);

Try to validate a the root element basically it does the following check as described by the XML-1.0 recommendation: - [ VC: Root Element Type ] it doesn't try to recurse or apply other check to the element

`ctxt` : | the validation context
`doc` : | a document instance
Returns : | 1 if valid or 0 otherwise

### xmlValidateElementDecl ()

    int         xmlValidateElementDecl          (xmlValidCtxtPtr ctxt,
                                                 xmlDocPtr doc,
                                                 xmlElementPtr elem);

Try to validate a single element definition basically it does the following checks as described by the XML-1.0 recommendation: - [ VC: One ID per Element Type ] - [ VC: No Duplicate Types ] - [ VC: Unique Element Type Declaration ]

`ctxt` : | the validation context
`doc` : | a document instance
`elem` : | an element definition
Returns : | 1 if valid or 0 otherwise

### xmlValidNormalizeAttributeValue ()

    xmlChar*    xmlValidNormalizeAttributeValue (xmlDocPtr doc,
                                                 xmlNodePtr elem,
                                                 const xmlChar *name,
                                                 const xmlChar *value);

Does the validation related extra step of the normalization of attribute values:

If the declared value is not CDATA, then the XML processor must further process the normalized attribute value by discarding any leading and trailing space (x20) characters, and by replacing sequences of space (x20) characters by single space (x20) character.

`doc` : | the document
`elem` : | the parent
`name` : | the attribute name
`value` : | the attribute value
Returns : | a new normalized string if normalization is needed, NULL otherwise the caller must free the returned value.

### xmlValidCtxtNormalizeAttributeValue ()

    xmlChar*    xmlValidCtxtNormalizeAttributeValue
                                                (xmlValidCtxtPtr ctxt,
                                                 xmlDocPtr doc,
                                                 xmlNodePtr elem,
                                                 const xmlChar *name,
                                                 const xmlChar *value);

Does the validation related extra step of the normalization of attribute values:

If the declared value is not CDATA, then the XML processor must further process the normalized attribute value by discarding any leading and trailing space (x20) characters, and by replacing sequences of space (x20) characters by single space (x20) character.

Also check VC: Standalone Document Declaration in P32, and update ctxt->valid accordingly

`ctxt` : | the validation context
`doc` : | the document
`elem` : | the parent
`name` : | the attribute name
`value` : | the attribute value
Returns : | a new normalized string if normalization is needed, NULL otherwise the caller must free the returned value.

### xmlValidateAttributeDecl ()

    int         xmlValidateAttributeDecl        (xmlValidCtxtPtr ctxt,
                                                 xmlDocPtr doc,
                                                 xmlAttributePtr attr);

Try to validate a single attribute definition basically it does the following checks as described by the XML-1.0 recommendation: - [ VC: Attribute Default Legal ] - [ VC: Enumeration ] - [ VC: ID Attribute Default ]

The ID/IDREF uniqueness and matching are done separately

`ctxt` : | the validation context
`doc` : | a document instance
`attr` : | an attribute definition
Returns : | 1 if valid or 0 otherwise

### xmlValidateAttributeValue ()

    int         xmlValidateAttributeValue       (xmlAttributeType type,
                                                 const xmlChar *value);

Validate that the given attribute value match the proper production

[ VC: ID ] Values of type ID must match the Name production....

[ VC: IDREF ] Values of type IDREF must match the Name production, and values of type IDREFS must match Names ...

[ VC: Entity Name ] Values of type ENTITY must match the Name production, values of type ENTITIES must match Names ...

[ VC: Name Token ] Values of type NMTOKEN must match the Nmtoken production; values of type NMTOKENS must match Nmtokens.

`type` : | an attribute type
`value` : | an attribute value
Returns : | 1 if valid or 0 otherwise

### xmlValidateNotationDecl ()

    int         xmlValidateNotationDecl         (xmlValidCtxtPtr ctxt,
                                                 xmlDocPtr doc,
                                                 xmlNotationPtr nota);

Try to validate a single notation definition basically it does the following checks as described by the XML-1.0 recommendation: - it seems that no validity constraint exists on notation declarations But this function get called anyway ...

`ctxt` : | the validation context
`doc` : | a document instance
`nota` : | a notation definition
Returns : | 1 if valid or 0 otherwise

### xmlValidateDtd ()

    int         xmlValidateDtd                  (xmlValidCtxtPtr ctxt,
                                                 xmlDocPtr doc,
                                                 xmlDtdPtr dtd);

Try to validate the document against the dtd instance

basically it does check all the definitions in the DtD.

`ctxt` : | the validation context
`doc` : | a document instance
`dtd` : | a dtd instance
Returns : | 1 if valid or 0 otherwise

### xmlValidateDtdFinal ()

    int         xmlValidateDtdFinal             (xmlValidCtxtPtr ctxt,
                                                 xmlDocPtr doc);

Does the final step for the dtds validation once all the subsets have been parsed

basically it does the following checks described by the XML Rec - check that ENTITY and ENTITIES type attributes default or possible values matches one of the defined entities. - check that NOTATION type attributes default or possible values matches one of the defined notations.

`ctxt` : | the validation context
`doc` : | a document instance
Returns : | 1 if valid or 0 if invalid and -1 if not well-formed

### xmlValidateDocument ()

    int         xmlValidateDocument             (xmlValidCtxtPtr ctxt,
                                                 xmlDocPtr doc);

Try to validate the document instance

basically it does the all the checks described by the XML Rec i.e. validates the internal and external subset (if present) and validate the document tree.

`ctxt` : | the validation context
`doc` : | a document instance
Returns : | 1 if valid or 0 otherwise

### xmlValidateElement ()

    int         xmlValidateElement              (xmlValidCtxtPtr ctxt,
                                                 xmlDocPtr doc,
                                                 xmlNodePtr elem);

Try to validate the subtree under an element

`ctxt` : | the validation context
`doc` : | a document instance
`elem` : | an element instance
Returns : | 1 if valid or 0 otherwise

### xmlValidateOneElement ()

    int         xmlValidateOneElement           (xmlValidCtxtPtr ctxt,
                                                 xmlDocPtr doc,
                                                 xmlNodePtr elem);

Try to validate a single element and it's attributes, basically it does the following checks as described by the XML-1.0 recommendation: - [ VC: Element Valid ] - [ VC: Required Attribute ] Then call xmlValidateOneAttribute() for each attribute present.

The ID/IDREF checkings are done separately

`ctxt` : | the validation context
`doc` : | a document instance
`elem` : | an element instance
Returns : | 1 if valid or 0 otherwise

### xmlValidateOneAttribute ()

    int         xmlValidateOneAttribute         (xmlValidCtxtPtr ctxt,
                                                 xmlDocPtr doc,
                                                 xmlNodePtr elem,
                                                 xmlAttrPtr attr,
                                                 const xmlChar *value);

Try to validate a single attribute for an element basically it does the following checks as described by the XML-1.0 recommendation: - [ VC: Attribute Value Type ] - [ VC: Fixed Attribute Default ] - [ VC: Entity Name ] - [ VC: Name Token ] - [ VC: ID ] - [ VC: IDREF ] - [ VC: Entity Name ] - [ VC: Notation Attributes ]

The ID/IDREF uniqueness and matching are done separately

`ctxt` : | the validation context
`doc` : | a document instance
`elem` : | an element instance
`attr` : | an attribute instance
`value` : | the attribute value (without entities processing)
Returns : | 1 if valid or 0 otherwise

### xmlValidateOneNamespace ()

    int         xmlValidateOneNamespace         (xmlValidCtxtPtr ctxt,
                                                 xmlDocPtr doc,
                                                 xmlNodePtr elem,
                                                 const xmlChar *prefix,
                                                 xmlNsPtr ns,
                                                 const xmlChar *value);

Try to validate a single namespace declaration for an element basically it does the following checks as described by the XML-1.0 recommendation: - [ VC: Attribute Value Type ] - [ VC: Fixed Attribute Default ] - [ VC: Entity Name ] - [ VC: Name Token ] - [ VC: ID ] - [ VC: IDREF ] - [ VC: Entity Name ] - [ VC: Notation Attributes ]

The ID/IDREF uniqueness and matching are done separately

`ctxt` : | the validation context
`doc` : | a document instance
`elem` : | an element instance
`prefix` : | the namespace prefix
`ns` : | an namespace declaration instance
`value` : | the attribute value (without entities processing)
Returns : | 1 if valid or 0 otherwise

### xmlValidateDocumentFinal ()

    int         xmlValidateDocumentFinal        (xmlValidCtxtPtr ctxt,
                                                 xmlDocPtr doc);

Does the final step for the document validation once all the incremental validation steps have been completed

basically it does the following checks described by the XML Rec

Check all the IDREF/IDREFS attributes definition for validity

`ctxt` : | the validation context
`doc` : | a document instance
Returns : | 1 if valid or 0 otherwise

### xmlValidateNotationUse ()

    int         xmlValidateNotationUse          (xmlValidCtxtPtr ctxt,
                                                 xmlDocPtr doc,
                                                 const xmlChar *notationName);

Validate that the given name match a notation declaration. - [ VC: Notation Declared ]

`ctxt` : | the validation context
`doc` : | the document
`notationName` : | the notation name to check
Returns : | 1 if valid or 0 otherwise

### xmlIsMixedElement ()

    int         xmlIsMixedElement               (xmlDocPtr doc,
                                                 const xmlChar *name);

Search in the DtDs whether an element accept Mixed content (or ANY) basically if it is supposed to accept text childs

`doc` : | the document
`name` : | the element name
Returns : | 0 if no, 1 if yes, and -1 if no element description is available

### xmlGetDtdAttrDesc ()

    xmlAttributePtr xmlGetDtdAttrDesc           (xmlDtdPtr dtd,
                                                 const xmlChar *elem,
                                                 const xmlChar *name);

Search the DTD for the description of this attribute on this element.

`dtd` : | a pointer to the DtD to search
`elem` : | the element name
`name` : | the attribute name
Returns : | the xmlAttributePtr if found or NULL

### xmlGetDtdQAttrDesc ()

    xmlAttributePtr xmlGetDtdQAttrDesc          (xmlDtdPtr dtd,
                                                 const xmlChar *elem,
                                                 const xmlChar *name,
                                                 const xmlChar *prefix);

Search the DTD for the description of this qualified attribute on this element.

`dtd` : | a pointer to the DtD to search
`elem` : | the element name
`name` : | the attribute name
`prefix` : | the attribute namespace prefix
Returns : | the xmlAttributePtr if found or NULL

### xmlGetDtdNotationDesc ()

    xmlNotationPtr xmlGetDtdNotationDesc        (xmlDtdPtr dtd,
                                                 const xmlChar *name);

Search the DTD for the description of this notation

`dtd` : | a pointer to the DtD to search
`name` : | the notation name
Returns : | the xmlNotationPtr if found or NULL

### xmlGetDtdQElementDesc ()

    xmlElementPtr xmlGetDtdQElementDesc         (xmlDtdPtr dtd,
                                                 const xmlChar *name,
                                                 const xmlChar *prefix);

Search the DTD for the description of this element

`dtd` : | a pointer to the DtD to search
`name` : | the element name
`prefix` : | the element namespace prefix
Returns : | the xmlElementPtr if found or NULL

### xmlGetDtdElementDesc ()

    xmlElementPtr xmlGetDtdElementDesc          (xmlDtdPtr dtd,
                                                 const xmlChar *name);

Search the DTD for the description of this element

`dtd` : | a pointer to the DtD to search
`name` : | the element name
Returns : | the xmlElementPtr if found or NULL

### xmlValidGetValidElements ()

    int         xmlValidGetValidElements        (xmlNode *prev,
                                                 xmlNode *next,
                                                 const xmlChar **list,
                                                 int max);

This function returns the list of authorized children to insert within an existing tree while respecting the validity constraints forced by the Dtd. The insertion point is defined using `prev` and `next` in the following ways: to insert before 'node': xmlValidGetValidElements(node->prev, node, ... to insert next 'node': xmlValidGetValidElements(node, node->next, ... to replace 'node': xmlValidGetValidElements(node->prev, node->next, ... to prepend a child to 'node': xmlValidGetValidElements(NULL, node->childs, to append a child to 'node': xmlValidGetValidElements(node->last, NULL, ...

pointers to the element names are inserted at the beginning of the array and do not need to be freed.

`prev` : | an element to insert after
`next` : | an element to insert next
`list` : | an array to store the list of child names
`max` : | the size of the array
Returns : | the number of element in the list, or -1 in case of error. If the function returns the value `max` the caller is invited to grow the receiving array and retry.

### xmlValidGetPotentialChildren ()

    int         xmlValidGetPotentialChildren    (xmlElementContent *ctree,
                                                 const xmlChar **list,
                                                 int *len,
                                                 int max);

Build/extend a list of potential children allowed by the content tree

`ctree` : | an element content tree
`list` : | an array to store the list of child names
`len` : | a pointer to the number of element in the list
`max` : | the size of the array
Returns : | the number of element in the list, or -1 in case of error.

### xmlValidateNameValue ()

    int         xmlValidateNameValue            (const xmlChar *value);

Validate that the given value match Name production

`value` : | an Name value
Returns : | 1 if valid or 0 otherwise

### xmlValidateNamesValue ()

    int         xmlValidateNamesValue           (const xmlChar *value);

Validate that the given value match Names production

`value` : | an Names value
Returns : | 1 if valid or 0 otherwise

### xmlValidateNmtokenValue ()

    int         xmlValidateNmtokenValue         (const xmlChar *value);

Validate that the given value match Nmtoken production

[ VC: Name Token ]

`value` : | an Nmtoken value
Returns : | 1 if valid or 0 otherwise

### xmlValidateNmtokensValue ()

    int         xmlValidateNmtokensValue        (const xmlChar *value);

Validate that the given value match Nmtokens production

[ VC: Name Token ]

`value` : | an Nmtokens value
Returns : | 1 if valid or 0 otherwise

### xmlValidBuildContentModel ()

    int         xmlValidBuildContentModel       (xmlValidCtxtPtr ctxt,
                                                 xmlElementPtr elem);

(Re)Build the automata associated to the content model of this element

`ctxt` : | a validation context
`elem` : | an element declaration node
Returns : | 1 in case of success, 0 in case of error

### xmlValidatePushElement ()

    int         xmlValidatePushElement          (xmlValidCtxtPtr ctxt,
                                                 xmlDocPtr doc,
                                                 xmlNodePtr elem,
                                                 const xmlChar *qname);

Push a new element start on the validation stack.

`ctxt` : | the validation context
`doc` : | a document instance
`elem` : | an element instance
`qname` : | the qualified name as appearing in the serialization
Returns : | 1 if no validation problem was found or 0 otherwise

### xmlValidatePushCData ()

    int         xmlValidatePushCData            (xmlValidCtxtPtr ctxt,
                                                 const xmlChar *data,
                                                 int len);

check the CData parsed for validation in the current stack

`ctxt` : | the validation context
`data` : | some character data read
`len` : | the lenght of the data
Returns : | 1 if no validation problem was found or 0 otherwise

### xmlValidatePopElement ()

    int         xmlValidatePopElement           (xmlValidCtxtPtr ctxt,
                                                 xmlDocPtr doc,
                                                 xmlNodePtr elem,
                                                 const xmlChar *qname);

Pop the element end from the validation stack.

`ctxt` : | the validation context
`doc` : | a document instance
`elem` : | an element instance
`qname` : | the qualified name as appearing in the serialization
Returns : | 1 if no validation problem was found or 0 otherwise