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Expat is a library, accounting in C, for parsing XML documents. It’s the basal XML parser for the accessible antecedent Mozilla project, Perl’s XML::Parser, Python’s xml.parsers.expat, and added open-source XML parsers.

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This library is the conception of James Clark, who’s additionally accustomed us groff (an nroff look-alike), Jade (an implemention of ISO’s DSSSL stylesheet accent for SGML), XP (a Java XML parser package), XT (a Java XSL engine). James was additionally the abstruse advance on the XML Alive Group at W3C that produced the XML specification.

This is chargeless software, accountant beneath the MIT/X Consortium license. You may download it from the Expat home page.

The aggregate of this certificate was originally commissioned as an commodity by XML.com. They affably accustomed Clark Cooper to absorb absorb and to administer it with Expat. This adaptation has been essentially continued to accommodate affidavit on appearance which acquire been added aback the aboriginal commodity was published, and added advice on appliance the aboriginal interface.

Expat is a stream-oriented parser. You annals callback (or handler) functions with the parser and afresh alpha agriculture it the document. As the parser recognizes genitalia of the document, it will alarm the adapted abettor for that allotment (if you’ve registered one.) The certificate is fed to the parser in pieces, so you can alpha parsing afore you acquire all the document. This additionally allows you to anatomize absolutely huge abstracts that won’t fit into memory.

Expat can be alarming due to the abounding kinds of handlers and options you can set. But you abandoned charge to apprentice four functions in adjustment to do 90% of what you’ll appetite to do with it:

These functions and others are declared in the advertence allotment of this document. The advertence area additionally describes in detail the ambit anesthetized to the altered types of handlers.

Let’s attending at a absolute simple archetype affairs that abandoned uses 3 of the aloft functions (it doesn’t charge to set a appearance handler.) The affairs outline.c prints an aspect outline, indenting adolescent elements to analyze them from the antecedent aspect that contains them. The alpha abettor does all the work. It prints two indenting spaces for every akin of antecedent elements, afresh it prints the aspect and aspect information. Finally it increments the all-around Abyss variable.

The end tag artlessly does the accounting assignment of decrementing Depth.

Note the XMLCALL animadversion acclimated for the callbacks. This is acclimated to ensure that the Expat and the callbacks are appliance the aforementioned calling assemblage in case the compiler options acclimated for Expat itself and the applicant cipher are different. Expat tries not to affliction what the absence calling assemblage is, admitting it may crave that it be aggregate with a absence assemblage of “cdecl” on some platforms. For cipher which uses Expat, however, the calling assemblage is authentic by the XMLCALL animadversion on best platforms; callbacks should be authentic appliance this annotation.

The XMLCALL animadversion was added in Expat 1.95.7, but absolute alive Expat applications don’t charge to add it (since they are already appliance the “cdecl” calling convention, or they wouldn’t be working). The animadversion is abandoned bare if the absence calling assemblage may be article added than “cdecl”. To use the animadversion cautiously with beforehand versions of Expat, you can conditionally ascertain it afterwards including Expat’s attack file:

After creating the parser, the capital affairs aloof has the job of blasting the certificate to the parser so that it can do its work.

The Expat administration comes as a aeroemism (with GNU gzip) tar file. You may download the latest adaptation from Antecedent Forge. Afterwards unpacking this, cd into the directory. Afresh chase either the Win32 admonition or Unix admonition below.

If you’re appliance the GNU compiler beneath cygwin, chase the Unix admonition in the aing section. Contrarily if you acquire Microsoft’s Developer Studio installed, afresh from Windows Explorer double-click on “expat.dsp” in the lib agenda and anatomy and install in the accepted manner.

Alternatively, you may download the Win32 bifold amalgamation that contains the “expat.h” accommodate book and a pre-built DLL.

First you’ll charge to run the configure carapace calligraphy in adjustment to configure the Makefiles and headers for your system.

If you’re blessed with all the defaults that configure picks for you, and you acquire permission on your arrangement to install into /usr/local, you can install Expat with this arrangement of commands:

There are some options that you can accommodate to this script, but the abandoned one we’ll acknowledgment actuality is the –prefix option. You can acquisition out all the options accessible by alive configure with aloof the –help option.

By default, the configure calligraphy sets things up so that the library gets installed in /usr/local/lib and the associated attack book in /usr/local/include. But if you were to accord the option, –prefix=/home/me/mystuff, afresh the library and attack would get installed in /home/me/mystuff/lib and /home/me/mystuff/include respectively.

Expat’s affection set can be configured appliance a baby cardinal of pre-processor definitions. The analogue of this syms does not affect the set of access credibility for Expat, abandoned the behavior of the API and the analogue of appearance types in the case of XML_UNICODE_WCHAR_T. The syms are:

Unless you installed Expat in a area not accepted by your compiler and linker, all you acquire to do to use Expat in your programs is to accommodate the Expat attack (#include <expat.h>) in your files that accomplish calls to it and to acquaint the linker that it needs to articulation adjoin the Expat library. On Unix systems, this would usually be done with the -lexpat argument. Otherwise, you’ll charge to acquaint the compiler area to attending for the Expat attack and the linker area to acquisition the Expat library. You may additionally charge to booty accomplish to acquaint the operating arrangement area to acquisition this library at run time.

On a Unix-based system, here’s what a Makefile ability attending like aback Expat is installed in a accepted location:

If you installed Expat in, say, /home/me/mystuff, afresh the Makefile would attending like this:

You’d additionally acquire to set the ambiance capricious LD_LIBRARY_PATH to /home/me/mystuff/lib (or to ${LD_LIBRARY_PATH}:/home/me/mystuff/lib if LD_LIBRARY_PATH already has some directories in it) in adjustment to run your application.

As we saw in the archetype in the overview, the aboriginal footfall in parsing an XML certificate with Expat is to actualize a parser object. There are three functions in the Expat API for creating a parser object. However, abandoned two of these (XML_ParserCreate and XML_ParserCreateNS) can be acclimated for amalgam a parser for a top-level document. The article alternating by these functions is an blurred arrow (i.e. “expat.h” declares it as abandoned *) to abstracts with added centralized structure. In adjustment to chargeless the anamnesis associated with this article you charge alarm XML_ParserFree. Note that if you acquire provided any user abstracts that gets stored in the parser, afresh your appliance is amenable for absolution it above-mentioned to calling XML_ParserFree.

The altar alternating by the parser conception functions are acceptable for parsing abandoned one XML certificate or alien parsed entity. If your appliance needs to anatomize abounding XML documents, afresh it needs to actualize a parser article for anniversary one. The best way to accord with this is to actualize a college akin article that contains all the absence initialization you appetite for your parser objects.

Walking through a certificate bureaucracy with a beck aggressive parser will crave a acceptable assemblage apparatus in adjustment to accrue clue of accepted context. For instance, to acknowledgment the simple question, “What aspect does this altercation accord to?” requires a stack, aback the parser may acquire descended into added elements that are accouchement of the accepted one and has encountered this altercation on the way out.

The things you’re acceptable to appetite to accrue on a assemblage are the currently opened aspect and it’s attributes. You advance this advice assimilate the assemblage in the alpha abettor and you pop it off in the end handler.

For some tasks, it is acceptable to aloof accrue advice on what the abyss of the assemblage is (or would be if you had one.) The outline affairs apparent aloft presents one example. Another such assignment would be absence over a complete element. Aback you see the alpha tag for the aspect you appetite to skip, you set a skip banderole and almanac the abyss at which the aspect started. Aback the end tag abettor encounters the aforementioned depth, the skipped aspect has concluded and the banderole may be cleared. If you chase the assemblage that the basis aspect starts at 1, afresh you can use the aforementioned capricious for skip banderole and skip depth.

Notice in the aloft archetype the aberration in how abyss is manipulated in the alpha and end handlers. The end tag abettor should be the mirror angel of the alpha tag handler. This is all-important to appropriately archetypal containment. Since, in the alpha tag handler, we incremented abyss afterwards the capital anatomy of alpha tag code, afresh in the end handler, we charge to dispense it afore the capital body. If we’d absitively to accession it aboriginal affair in the alpha handler, afresh we’d acquire had to cutback it aftermost affair in the end handler.

In adjustment to be able to canyon advice amid altered handlers afterwards appliance globals, you’ll charge to ascertain a abstracts anatomy to authority the aggregate variables. You can afresh acquaint Expat (with the XML_SetUserData function) to canyon a arrow to this anatomy to the handlers. This is the aboriginal altercation accustomed by best handlers. In the advertence section, an altercation to a callback activity is alleged userData and acquire blazon abandoned * if the user abstracts is passed; it will acquire the blazon XML_Parser if the parser itself is passed. Aback the parser is passed, the user abstracts may be retrieved appliance XML_GetUserData.

One accepted case area assorted calls to a audible abettor may charge to acquaint appliance an appliance abstracts anatomy is the case aback agreeable anesthetized to the appearance abstracts abettor (set by XML_SetCharacterDataHandler) needs to be accumulated. A accepted first-time aberration with any of the event-oriented interfaces to an XML parser is to apprehend all the altercation absolute in an aspect to be arise by a audible alarm to the appearance abstracts handler. Expat, like abounding added XML parsers, letters such abstracts as a arrangement of calls; there’s no way to apperceive aback the end of the arrangement is able until a altered callback is made. A absorber referenced by the user abstracts anatomy proves both an able and acceptable abode to accrue appearance data.

Expat is an XML 1.0 parser, and as such never complains based on the bulk of the adaptation pseudo-attribute in the XML declaration, if present.

If an appliance needs to analysis the adaptation cardinal (to abutment alternating processing), it should use the XML_SetXmlDeclHandler activity to set a abettor that uses the advice in the XML acknowledgment to actuate what to do. This archetype shows how to analysis that abandoned a adaptation cardinal of “1.0” is accepted:

When the parser is created appliance the XML_ParserCreateNS, function, Expat performs namespace processing. Beneath namespace processing, Expat consumes xmlns and xmlns:… attributes, which acknowledge namespaces for the ambit of the aspect in which they occur. This agency that your alpha abettor will not see these attributes. Your appliance can still be a of these declarations by ambience namespace acknowledgment handlers with XML_SetNamespaceDeclHandler.

Element blazon and aspect names that accord to a accustomed namespace are anesthetized to the adapted abettor in broadcast form. By absence this broadcast anatomy is a chain of the namespace URI, the separator appearance (which is the 2nd altercation to XML_ParserCreateNS), and the bounded name (i.e. the allotment afterwards the colon). Names with absolute prefixes are not admirable aback namespace processing is enabled, and will activate an error. Unprefixed aspect names are never expanded, and unprefixed aspect names are abandoned broadcast aback they are in the ambit of a absence namespace.

However if XML_SetReturnNSTriplet has been alleged with a non-zero do_nst parameter, afresh the broadcast anatomy for names with an absolute prefix is a chain of: URI, separator, bounded name, separator, prefix.

You can set handlers for the alpha of a namespace acknowledgment and for the end of a ambit of a acknowledgment with the XML_SetNamespaceDeclHandler function. The StartNamespaceDeclHandler is alleged above-mentioned to the alpha tag abettor and the EndNamespaceDeclHandler is alleged afterwards the agnate end tag that ends the namespace’s scope. The namespace alpha abettor gets anesthetized the prefix and URI for the namespace. For a absence namespace acknowledgment (xmlns=’…’), the prefix will be null. The URI will be absent for the case area the absence namespace is actuality unset. The namespace end abettor aloof gets the prefix for the closing scope.

These handlers are alleged for anniversary declaration. So if, for instance, a alpha tag had three namespace declarations, afresh the StartNamespaceDeclHandler would be alleged three times afore the alpha tag abettor is called, already for anniversary declaration.

While XML is based on Unicode, and every XML processor is adapted to accustomed UTF-8 and UTF-16 (1 and 2 byte encodings of Unicode), added encodings may be declared in XML abstracts or entities. For the capital document, an XML acknowledgment may accommodate an encoding declaration:

External parsed entities may activate with a altercation declaration, which looks like an XML acknowledgment with aloof an encoding declaration:

With Expat, you may additionally specify an encoding at the time of creating a parser. This is advantageous aback the encoding advice may arise from a antecedent alfresco the certificate itself (like a college akin protocol.)

There are four congenital encodings in Expat:

Anything abroad apparent in an encoding acknowledgment or in the agreement encoding authentic in the parser constructor, triggers a alarm to the UnknownEncodingHandler. This abettor gets anesthetized the encoding name and a arrow to an XML_Encoding abstracts structure. Your abettor charge ample in this anatomy and acknowledgment XML_STATUS_OK if it knows how to accord with the encoding. Contrarily the abettor should acknowledgment XML_STATUS_ERROR. The abettor additionally gets anesthetized a arrow to an alternative appliance abstracts anatomy that you may announce aback you set the handler.

Expat places restrictions on appearance encodings that it can abutment by bushing in the XML_Encoding structure. accommodate file:

XML_Encoding contains an arrangement of integers that accord to the 1st byte of an encoding sequence. If the bulk in the arrangement for a byte is aught or positive, afresh the byte is a audible byte encoding that encodes the Unicode scalar bulk absolute in the array. A -1 in this arrangement indicates a abnormal byte. If the bulk is -2, -3, or -4, afresh the byte is the alpha of a 2, 3, or 4 byte arrangement respectively. Multi-byte sequences are beatific to the catechumen activity acicular at in the XML_Encoding structure. This activity should acknowledgment the Unicode scalar bulk for the arrangement or -1 if the arrangement is malformed.

One pitfall that amateur Expat users are acceptable to abatement into is that although Expat may acquire ascribe in assorted encodings, the strings that it passes to the handlers are consistently encoded in UTF-8 or UTF-16 (depending on how Expat was compiled). Your appliance is amenable for any adaptation of these strings into added encodings.

Expat does not apprehend or anatomize alien entities directly. Note that any alien DTD is a adapted case of an alien entity. If you’ve set no ExternalEntityRefHandler, afresh alien article references are silently ignored. Otherwise, it calls your abettor with the advice bare to apprehend and anatomize the alien entity.

Your abettor isn’t absolutely amenable for parsing the entity, but it is amenable for creating a accessory parser with XML_ExternalEntityParserCreate that will do the job. This allotment an instance of XML_Parser that has handlers and added abstracts structures initialized from the antecedent parser. You may afresh use XML_Parse or XML_ParseBuffer calls adjoin this parser. Aback alien entities my accredit to added alien entities, your abettor should be able to be alleged recursively.

In adjustment to anatomize constant entities, afore starting the parse, you charge alarm XML_SetParamEntityParsing with one of the afterward arguments:

In adjustment to apprehend an alien DTD, you additionally acquire to set an alien article advertence abettor as declared above.

Expat 1.95.8 introduces a new feature: its now accessible to stop parsing briefly from aural a abettor function, alike if added abstracts has already been anesthetized into the parser. Applications for this include

To booty advantage of this feature, the capital parsing bend of an appliance needs to abutment this specifically. It cannot be authentic with a parsing bend accordant with Expat 1.95.7 or beforehand (though absolute loops will abide to assignment afterwards acknowledging the stop/resume feature).

An appliance that uses this affection for a audible parser will acquire the asperous anatomy (in pseudo-code):

An appliance that may resume any of several parsers based on ascribe (either from the XML actuality parsed or some added source) will absolutely acquire added absorbing ascendancy structures.

This C activity could be acclimated for the parse_xml activity mentioned in the pseudo-code above:

The agnate continue_parsing activity is somewhat simpler, aback it abandoned charge accord with the acknowledgment cipher from XML_ResumeParser; it can agent the ascribe administration to the parse_xml function:

Now that we’ve apparent what a blend the top-level parsing bend can become, what acquire we gained? Absolute simply, we can now use the XML_StopParser activity to stop parsing, afterwards accepting to go to abundant lengths to abstain added processing that we’re assured to ignore. As a bonus, we get to stop parsing temporarily, and arise aback to it aback we’re ready.

To stop parsing from a abettor function, use the XML_StopParser function. This activity takes two arguments; the parser actuality chock-full and a banderole advertence whether the anatomize can be resumed in the future.

Construct a new parser appliance the apartment of anamnesis administration functions authentic in ms. If ms is NULL, afresh use the accepted set of anamnesis administration functions. If sep is non NULL, afresh namespace processing is enabled in the created parser and the appearance acicular at by sep is acclimated as the separator amid the namespace URI and the bounded allotment of the name.

Construct a new XML_Parser article for parsing an alien accepted entity. Ambience is the ambience altercation anesthetized in a alarm to a ExternalEntityRefHandler. Added accompaniment advice such as handlers, user data, namespace processing is affiliated from the parser anesthetized as the 1st argument. So you shouldn’t charge to alarm any of the behavior alteration functions on this parser (unless you appetite it to act abnormally than the antecedent parser).

To accompaniment the obvious: the three parsing functions XML_Parse, XML_ParseBuffer and XML_GetBuffer charge not be alleged from aural a abettor unless they accomplish on a abstracted parser instance, that is, one that did not alarm the handler. For example, it is OK to alarm the parsing functions from aural an XML_ExternalEntityRefHandler, if they administer to the parser created by XML_ExternalEntityParserCreate.

Note: the len altercation anesthetized to these functions should be appreciably beneath than the best bulk for an integer, as it could actualize an accumulation overflow bearings if the added lengths of a absorber and the chapped allocation of the antecedent absorber beat the best accumulation value. Ascribe abstracts at the end of a absorber will abide chapped if it is allotment of an XML badge for which the end is not allotment of that buffer.

Anatomize some added of the document. The cord s is a absorber absolute allotment (or conceivably all) of the document. The cardinal of bytes of s that are allotment of the certificate is adumbrated by len. This agency that s doesn’t acquire to be absent terminated. It additionally agency that if len is beyond than the cardinal of bytes in the block of anamnesis that s credibility at, afresh a anamnesis accountability is likely. The isFinal constant informs the parser that this is the aftermost allotment of the document. Frequently, the aftermost allotment is abandoned (i.e. len is zero.) If a anatomize absurdity occurred, it allotment XML_STATUS_ERROR. Contrarily it allotment XML_STATUS_OK value.

Stops parsing, causing XML_Parse or XML_ParseBuffer to return. Charge be alleged from aural a call-back handler, except aback aborticide (when resumable is XML_FALSE) an already abeyant parser. Some call-backs may still chase because they would contrarily get lost, including

This can be alleged from best handlers, including DTD accompanying call-backs, except aback parsing an alien constant article and resumable is XML_TRUE. Allotment XML_STATUS_OK aback successful, XML_STATUS_ERROR otherwise. The accessible absurdity codes are:

Since the stop/resume affection requires appliance abutment in the alien parsing loop, it is an absurdity to alarm this activity for a parser not actuality handled appropriately; see Briefly Stopping Parsing for added information.

When resumable is XML_TRUE afresh parsing is suspended, that is, XML_Parse and XML_ParseBuffer acknowledgment XML_STATUS_SUSPENDED. Otherwise, parsing is aborted, that is, XML_Parse and XML_ParseBuffer acknowledgment XML_STATUS_ERROR with absurdity cipher XML_ERROR_ABORTED.

Note: This will be activated to the accepted parser instance only, that is, if there is a antecedent parser afresh it will abide parsing aback the alien article advertence abettor returns. It is up to the accomplishing of that abettor to alarm XML_StopParser on the antecedent parser (recursively), if one wants to stop parsing altogether.

When suspended, parsing can be resumed by calling XML_ResumeParser.

New in Expat 1.95.8.

Resumes parsing afterwards it has been abeyant with XML_StopParser. Charge not be alleged from aural a abettor call-back. Allotment aforementioned cachet codes as XML_Parse or XML_ParseBuffer. An added absurdity code, XML_ERROR_NOT_SUSPENDED, will be alternating if the parser was not currently suspended.

Note: This charge be alleged on the best acutely nested adolescent parser instance first, and on its antecedent parser abandoned afterwards the adolescent parser has finished, to be activated recursively until the certificate entity’s parser is restarted. That is, the antecedent parser will not resume by itself and it is up to the appliance to alarm XML_ResumeParser on it at the adapted moment.

New in Expat 1.95.8.

Returns cachet of parser with account to actuality initialized, parsing, finished, or suspended, and whether the final absorber is actuality processed. The cachet constant charge not be NULL.

New in Expat 1.95.8.

Although handlers are about set above-mentioned to parsing and larboard alone, an appliance may accept to set or change the abettor for a parsing blow while the anatomize is in progress. For instance, your appliance may accept to abstain all altercation not descended from a para element. One way it could do this is to set the appearance abettor aback a para alpha tag is seen, and unset it for the agnate end tag.

A abettor may be unset by accouterment a NULL arrow to the adapted abettor setter. None of the abettor ambience functions acquire a acknowledgment value.

Your handlers will be accepting strings in arrays of blazon XML_Char. This blazon is conditionally authentic in expat.h as either char, wchar_t or bearding short. The aloft implies UTF-8 encoding, the closing two betoken UTF-16 encoding. Note that you’ll accept them in this anatomy absolute of the aboriginal encoding of the document.

Set abettor for alpha (and empty) tags. Attributes are anesthetized to the alpha abettor as a arrow to a agent of burn pointers. Anniversary aspect apparent in a alpha (or empty) tag occupies 2 afterwards places in this vector: the aspect name followed by the aspect value. These pairs are concluded by a absent pointer.

Note that an abandoned tag generates a alarm to both alpha and end handlers (in that order).

Set abettor for end (and empty) tags. As acclaimed above, an abandoned tag generates a alarm to both alpha and end handlers.

Set handlers for alpha and end tags with one call.

Set a altercation handler. The cord your abettor receives is NOT nul-terminated. You acquire to use the breadth altercation to accord with the end of the string. A audible block of aing altercation chargeless of markup may still aftereffect in a arrangement of calls to this handler. In added words, if you’re analytic for a arrangement in the text, it may be breach beyond calls to this handler. Note: Ambience this abettor to NULL may NOT anon aish call-backs if the parser is currently processing such a audible block of aing markup-free text, as the parser will abide calling aback until the end of the block is reached.

Set a abettor for processing instructions. The ambition is the aboriginal chat in the processing instruction. The abstracts is the blow of the characters in it afterwards absence all whitespace afterwards the antecedent word.

Set a abettor for comments. The abstracts is all altercation central the animadversion delimiters.

Set a abettor that gets alleged at the alpha of a CDATA section.

Set a abettor that gets alleged at the end of a CDATA section.

Sets both CDATA area handlers with one call.

Sets a abettor for any characters in the certificate which wouldn’t contrarily be handled. This includes both abstracts for which no handlers can be set (like some kinds of DTD declarations) and abstracts which could be arise but which currently has no abettor set. The characters are anesthetized absolutely as they were present in the XML certificate except that they will be encoded in UTF-8 or UTF-16. Band boundaries are not normalized. Note that a byte adjustment mark appearance is not anesthetized to the absence handler. There are no guarantees about how characters are disconnected amid calls to the absence handler: for example, a animadversion ability be breach amid assorted calls. Ambience the abettor with this alarm has the ancillary aftereffect of axis off amplification of references to internally authentic accepted entities. Instead these references are anesthetized to the absence handler.

See additionally XML_DefaultCurrent.

This sets a absence handler, but doesn’t arrest the amplification of centralized article references. The article advertence will not be anesthetized to the absence handler.

See additionally XML_DefaultCurrent.

Set an alien article advertence handler. This abettor is additionally alleged for processing an alien DTD subset if constant article parsing is in effect. (See XML_SetParamEntityParsing.)

The ambience constant specifies the parsing ambience in the architecture accepted by the ambience altercation to XML_ExternalEntityParserCreate. cipher is authentic abandoned until the abettor returns, so if the referenced article is to be parsed later, it charge be copied. ambience is NULL abandoned aback the article is a constant entity, which is how one can differentiate amid accepted and constant entities.

The abject constant is the abject to use for about arrangement identifiers. It is set by XML_SetBase and may be NULL. The publicId constant is the accessible id accustomed in the article acknowledgment and may be NULL. systemId is the arrangement identifier authentic in the article acknowledgment and is never NULL.

There are a brace of agency in which this abettor differs from others. First, this abettor allotment a cachet indicator (an integer). XML_STATUS_OK should be alternating for acknowledged administration of the alien article reference. Returning XML_STATUS_ERROR indicates failure, and causes the calling parser to acknowledgment an XML_ERROR_EXTERNAL_ENTITY_HANDLING error.

Second, instead of accepting the user abstracts as its aboriginal argument, it receives the parser that encountered the article reference. This, forth with the ambience parameter, may be acclimated as arguments to a alarm to XML_ExternalEntityParserCreate. Appliance the alternating parser, the anatomy of the alien article can be recursively parsed.

Since this abettor may be alleged recursively, it should not be extenuative advice into all-around or changeless variables.

Set the altercation anesthetized to the ExternalEntityRefHandler. If arg is not NULL, it is the new bulk anesthetized to the abettor set appliance XML_SetExternalEntityRefHandler; if arg is NULL, the altercation anesthetized to the abettor activity will be the parser article itself.

Note: The blazon of arg and the blazon of the aboriginal altercation to the ExternalEntityRefHandler do not match. This activity takes a abandoned * to be anesthetized to the handler, while the abettor accepts an XML_Parser. This is a absolute accident, but will not be adapted afore Expat 2.0 (at the earliest) to abstain causing compiler warnings for cipher that’s accepted to assignment with this API. It is the albatross of the appliance cipher to apperceive the absolute blazon of the altercation anesthetized to the abettor and to administer it properly.

Set a skipped article handler. This is alleged in two situations:

The is_parameter_entity altercation will be non-zero for a constant article and aught for a accepted entity.

Note: skipped constant entities in declarations and skipped accepted entities in aspect ethics cannot be reported, because the blow would be out of accompany with the advertisement of the declarations or aspect values

Set a abettor to accord with encodings added than the congenital in set. This should be done afore XML_Parse or XML_ParseBuffer acquire been alleged on the accustomed parser.

If the abettor knows how to accord with an encoding with the accustomed name, it should ample in the advice abstracts anatomy and acknowledgment XML_STATUS_OK. Contrarily it should acknowledgment XML_STATUS_ERROR. The abettor will be alleged at best already per parsed (external) entity. The alternative appliance abstracts arrow encodingHandlerData will be anesthetized aback to the handler.

The map arrangement contains advice for every accessible accessible arch byte in a byte sequence. If the agnate bulk is >= 0, afresh it’s a audible byte arrangement and the byte encodes that Unicode value. If the bulk is -1, afresh that byte is invalid as the antecedent byte in a sequence. If the bulk is -n, area n is an accumulation > 1, afresh n is the cardinal of bytes in the arrangement and the absolute about-face is able by a alarm to the activity acicular at by convert. This activity may acknowledgment -1 if the arrangement itself is invalid. The catechumen arrow may be absent if there are abandoned audible byte codes. The abstracts constant anesthetized to the catechumen activity is the abstracts arrow from XML_Encoding. The cord s is NOT nul-terminated and credibility at the arrangement of bytes to be converted.

The activity acicular at by absolution is alleged by the parser aback it is able with the encoding. It may be NULL.

Set a abettor to be alleged aback a namespace is declared. Namespace declarations activity central alpha tags. But the namespace acknowledgment alpha abettor is alleged afore the alpha tag abettor for anniversary namespace declared in that alpha tag.

Set a abettor to be alleged aback abrogation the ambit of a namespace declaration. This will be called, for anniversary namespace declaration, afterwards the abettor for the end tag of the aspect in which the namespace was declared.

Sets both namespace acknowledgment handlers with a audible call.

Sets a abettor that is alleged for XML declarations and additionally for altercation declarations apparent in alien entities. The way to analyze is that the adaptation constant will be NULL for altercation declarations. The encoding constant may be NULL for an XML declaration. The standalone altercation will accommodate -1, 0, or 1 advertence appropriately that there was no standalone constant in the declaration, that it was accustomed as no, or that it was accustomed as yes.

Set a abettor that is alleged at the alpha of a DOCTYPE declaration, afore any alien or centralized subset is parsed. Both sysid and pubid may be NULL. The has_internal_subset will be non-zero if the DOCTYPE acknowledgment has an centralized subset.

Set a abettor that is alleged at the end of a DOCTYPE declaration, afterwards parsing any alien subset.

Set both doctype handlers with one call.

Sets a abettor for aspect declarations in a DTD. The abettor gets alleged with the name of the aspect in the acknowledgment and a arrow to a anatomy that contains the aspect model. It is the application’s albatross to chargeless this abstracts anatomy appliance XML_FreeContentModel.

The archetypal altercation is the basis of a timberline of XML_Content nodes. If blazon equals XML_CTYPE_EMPTY or XML_CTYPE_ANY, afresh assistant will be XML_CQUANT_NONE, and the added fields will be aught or NULL. If blazon is XML_CTYPE_MIXED, afresh assistant will be XML_CQUANT_NONE or XML_CQUANT_REP and numchildren will accommodate the cardinal of elements that are accustomed to be alloyed in and accouchement credibility to an arrangement of XML_Content structures that will all acquire blazon XML_CTYPE_NAME with no quantification. Abandoned the basis bulge can be blazon XML_CTYPE_EMPTY, XML_CTYPE_ANY, or XML_CTYPE_MIXED.

For blazon XML_CTYPE_NAME, the name acreage credibility to the name and the numchildren and accouchement fields will be aught and NULL. The assistant acreage will announce any quantifiers placed on the name.

Types XML_CTYPE_CHOICE and XML_CTYPE_SEQ announce a best or arrangement respectively. The numchildren acreage indicates how abounding nodes in the best or arrangement and accouchement credibility to the nodes.

Set a abettor for attlist declarations in the DTD. This abettor is alleged for anniversary attribute. So a audible attlist acknowledgment with assorted attributes declared will accomplish assorted calls to this handler. The elname constant allotment the name of the aspect for which the aspect is actuality declared. The aspect name is in the attname parameter. The aspect blazon is in the att_type parameter. It is the cord apery the blazon in the acknowledgment with whitespace removed.

The dflt constant holds the absence value. It will be NULL in the case of “#IMPLIED” or “#REQUIRED” attributes. You can analyze these two cases by blockage the isrequired parameter, which will be authentic in the case of “#REQUIRED” attributes. Attributes which are “#FIXED” will acquire additionally acquire a authentic isrequired, but they will acquire the non-NULL anchored bulk in the dflt parameter.

Sets a abettor that will be alleged for all article declarations. The is_parameter_entity altercation will be non-zero in the case of constant entities and aught otherwise.

For centralized entities (<!ENTITY foo “bar”>), bulk will be non-NULL and systemId, publicId, and notationName will all be NULL. The bulk cord is not NULL terminated; the breadth is provided in the value_length parameter. Do not use value_length to analysis for centralized entities, aback it is acknowledged to acquire zero-length values. Instead analysis for whether or not bulk is NULL.

The notationName altercation will acquire a non-NULL bulk abandoned for unparsed article declarations.

Set a abettor that receives declarations of unparsed entities. These are article declarations that acquire a characters (NDATA) field:

This abettor is anachronistic and is provided for backwards compatibility. Use instead XML_SetEntityDeclHandler.

Set a abettor that receives characters declarations.

Set a abettor that is alleged if the certificate is not “standalone”. This happens aback there is an alien subset or a advertence to a constant entity, but does not acquire standalone set to “yes” in an XML declaration. If this abettor allotment XML_STATUS_ERROR, afresh the parser will bandy an XML_ERROR_NOT_STANDALONE error.

These are the functions you’ll appetite to alarm aback the anatomize functions acknowledgment XML_STATUS_ERROR (a anatomize absurdity has occurred), although the position advertisement functions are advantageous alfresco of errors. The position arise is the byte position (in the aboriginal certificate or article encoding) of the aboriginal of the arrangement of characters that generated the accepted blow (or the absurdity that acquired the anatomize functions to acknowledgment XML_STATUS_ERROR.) The exceptions are callbacks trigged by declarations in the certificate prologue, in which case they exact position arise is about in the accordant markup, but not necessarily as allusive as for added events.

The position advertisement functions are authentic abandoned alfresco of the DTD. In added words, they usually acknowledgment artificial advice aback alleged from aural a DTD acknowledgment handler.

Acknowledgment what blazon of absurdity has occurred.

Acknowledgment the band cardinal of the position. The aboriginal band is arise as 1.

Acknowledgment the offset, from the alpha of the accepted line, of the position.

Acknowledgment the cardinal of bytes in the accepted event. Allotment 0 if the blow is central a advertence to an centralized article and for the end-tag blow for abandoned aspect tags (the afterwards can be acclimated to analyze empty-element tags from abandoned elements appliance abstracted alpha and end tags).

Returns the parser’s ascribe buffer, sets the accumulation acicular at by account to the account aural this absorber of the accepted anatomize position, and set the accumulation acicular at by admeasurement to the admeasurement of the alternating buffer.

This should abandoned be alleged from aural a abettor during an alive anatomize and the alternating absorber should abandoned be referred to from aural the abettor that fabricated the call. This ascribe absorber contains the untranslated bytes of the input.

Only a bound bulk of ambience is kept, so if the blow triggering a alarm spans over a absolute ample bulk of input, the absolute anatomize position may be afore the alpha of the buffer.

If XML_CONTEXT_BYTES is not defined, this will consistently acknowledgment NULL.

The functions in this area either access accompaniment advice from the parser or can be acclimated to dynamicly set parser options.

This sets the user abstracts arrow that gets anesthetized to handlers. It overwrites any antecedent bulk for this pointer. Note that the appliance is amenable for absolution the anamnesis associated with userData aback it is able with the parser. So if you alarm this aback there’s already a arrow there, and you haven’t freed the anamnesis associated with it, afresh you’ve apparently aloof leaked memory.

This allotment the user abstracts arrow that gets anesthetized to handlers. It is absolutely implemented as a macro.

Set the abject to be acclimated for absolute about URIs in arrangement identifiers. The acknowledgment bulk is XML_STATUS_ERROR if there’s no anamnesis to abundance base, contrarily it’s XML_STATUS_OK.

Acknowledgment the abject for absolute about URIs.

Aback attributes are arise to the alpha abettor in the atts vector, attributes that were absolutely set in the aspect activity afore any attributes that accept their bulk from absence advice in an ATTLIST declaration. This activity allotment the cardinal of attributes that were absolutely set times two, appropriately giving the account in the atts arrangement anesthetized to the alpha tag abettor of the aboriginal aspect set due to defaults. It food advice for the aftermost alarm to a alpha handler. If alleged central a alpha handler, afresh that agency the accepted call.

Allotment an arrangement of XML_AttrInfo structures for the attribute/value pairs anesthetized in the aftermost alarm to the XML_StartElementHandler that were authentic in the start-tag rather than defaulted. Anniversary attribute/value brace counts as 1; appropriately the cardinal of entries in the arrangement is XML_GetSpecifiedAttributeCount(parser) / 2.

Note: This alarm is optional, as the parser will auto-generate a new accidental alkali bulk if no bulk has been set at the alpha of parsing.

This activity allows an appliance to accommodate an alien subset for the certificate blazon acknowledgment for abstracts which do not specify an alien subset of their own. For abstracts which specify an alien subset in their DOCTYPE declaration, the application-provided subset will be ignored. If the certificate does not accommodate a DOCTYPE acknowledgment at all and useDTD is true, the application-provided subset will be parsed, but the startDoctypeDeclHandler and endDoctypeDeclHandler functions, if set, will not be called. The ambience of constant article parsing, controlled appliance XML_SetParamEntityParsing, will be honored.

The application-provided alien subset is apprehend by calling the alien article advertence abettor set via XML_SetExternalEntityRefHandler with both publicId and systemId set to NULL.

If this activity is alleged afterwards parsing has begun, it allotment XML_ERROR_CANT_CHANGE_FEATURE_ONCE_PARSING and ignores useDTD. If alleged aback Expat has been aggregate afterwards DTD support, it allotment XML_ERROR_FEATURE_REQUIRES_XML_DTD. Otherwise, it allotment XML_ERROR_NONE.

Note: For the purpose of blockage WFC: Article Declared, casual useDTD == XML_TRUE will accomplish the parser behave as if the certificate had a DTD with an alien subset. This holds authentic alike if the alien article advertence abettor allotment afterwards action.

This activity abandoned has an aftereffect aback appliance a parser created with XML_ParserCreateNS, i.e. aback namespace processing is in effect. The do_nst sets whether or not prefixes are alternating with names able with a namespace prefix. If this activity is alleged with do_nst non-zero, afresh afterwards namespace able names (that is able with a prefix as against to acceptance to a absence namespace) are alternating as a leash with the three genitalia afar by the namespace separator authentic aback the parser was created. The adjustment of alternating genitalia is URI, bounded name, and prefix.

If do_nst is zero, afresh namespaces are arise in the absence manner, URI afresh local_name afar by the namespace separator.

Acknowledgment the library adaptation as a cord (e.g. “expat_1.95.1”).

Returns a account of “feature” records, accouterment capacity on how Expat was configured at abridge time. Best applications should not charge to anguish about this, but this advice is contrarily not accessible from Expat. This activity allows cipher that does charge to analysis these appearance to do so at runtime.

The acknowledgment bulk is an arrangement of XML_Feature, concluded by a almanac with a affection of XML_FEATURE_END and name of NULL, anecdotic the feature-test macros Expat was aggregate with. Aback an appliance that requires this affectionate of advice needs to actuate the blazon of appearance the name credibility to, annal for the XML_FEATURE_SIZEOF_XML_CHAR and XML_FEATURE_SIZEOF_XML_LCHAR will be amid at the alpha of the list, followed by XML_FEATURE_UNICODE and XML_FEATURE_UNICODE_WCHAR_T, if they are present at all.

Some appearance acquire an associated value. If there isn’t an associated value, the bulk acreage is set to 0. At this time, the afterward appearance acquire been authentic to acquire values:

The afterward functions acquiesce alien cipher to allotment the anamnesis allocator an XML_Parser has been configured to use. This is abnormally advantageous for third-party libraries that collaborate with a parser article created by appliance code, or heavily layered applications. This can be capital aback appliance dynamically loaded libraries which use altered C accepted libraries (this can appear on Windows, at least).

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