为什么通过 XSD 进行的 XML 验证在 libxml2 中失败(但在 xmllint 中成功)以及如何修复它?

发布于 2024-11-15 01:44:26 字数 4541 浏览 5 评论 0原文

如果我通过 xmllint: 运行此 XML 验证

xmllint --noout --schema schema.xsd test.xml

我会收到此成功消息:

.../test.xml validates

但是,如果我运行相同的验证通过libxml2的C API:

int result = xmlSchemaValidateDoc(...)

我得到返回值1845和这个失败消息:

Element '{http://example.com/XMLSchema/1.0}foo': No matching global declaration available for the validation root.

我绝对可以做到没有感觉。 :(


schema.xsd:

<?xml version="1.0" encoding="utf-8" ?>
<!DOCTYPE xs:schema PUBLIC "-//W3C//DTD XMLSCHEMA 200102//EN" "XMLSchema.dtd" >
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns="http://example.com/XMLSchema/1.0" targetNamespace="http://example.com/XMLSchema/1.0" elementFormDefault="qualified" attributeFormDefault="unqualified">

    <xs:element name="foo">
    </xs:element>
</xs:schema>

test.xml:

<?xml version="1.0" encoding="UTF-8"?>

<foo xmlns="http://example.com/XMLSchema/1.0">
</foo>

ma​​in.c:

#include <stdio.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <string.h>

#include <libxml/parser.h>
#include <libxml/valid.h>
#include <libxml/xmlschemas.h>

u_int32_t get_file_size(const char *file_name) {
    struct stat buf;
    if ( stat(file_name, &buf) != 0 ) return(0);
    return (unsigned int)buf.st_size;
}

void handleValidationError(void *ctx, const char *format, ...) {
    char *errMsg;
    va_list args;
    va_start(args, format);
    vasprintf(&errMsg, format, args);
    va_end(args);
    fprintf(stderr, "Validation Error: %s", errMsg);
    free(errMsg);
}

int main (int argc, const char * argv[]) {
    const char *xsdPath = argv[1];
    const char *xmlPath = argv[2];

    printf("\n");

    printf("XSD File: %s\n", xsdPath);
    printf("XML File: %s\n", xmlPath);

    int xmlLength = get_file_size(xmlPath);
    char *xmlSource = (char *)malloc(sizeof(char) * xmlLength);

    FILE *p = fopen(xmlPath, "r");
    char c;
    unsigned int i = 0;
    while ((c = fgetc(p)) != EOF) {
        xmlSource[i++] = c;
    }
    printf("\n");

    printf("XML Source:\n\n%s\n", xmlSource);
    fclose(p);

    printf("\n");

    int result = 42;
    xmlSchemaParserCtxtPtr parserCtxt = NULL;
    xmlSchemaPtr schema = NULL;
    xmlSchemaValidCtxtPtr validCtxt = NULL;

    xmlDocPtr xmlDocumentPointer = xmlParseMemory(xmlSource, xmlLength);
    parserCtxt = xmlSchemaNewParserCtxt(xsdPath);

    if (parserCtxt == NULL) {
        fprintf(stderr, "Could not create XSD schema parsing context.\n");
        goto leave;
    }

    schema = xmlSchemaParse(parserCtxt);

    if (schema == NULL) {
        fprintf(stderr, "Could not parse XSD schema.\n");
        goto leave;
    }

    validCtxt = xmlSchemaNewValidCtxt(schema);

    if (!validCtxt) {
        fprintf(stderr, "Could not create XSD schema validation context.\n");
        goto leave;
    }

    xmlSetStructuredErrorFunc(NULL, NULL);
    xmlSetGenericErrorFunc(NULL, handleValidationError);
    xmlThrDefSetStructuredErrorFunc(NULL, NULL);
    xmlThrDefSetGenericErrorFunc(NULL, handleValidationError);

    result = xmlSchemaValidateDoc(validCtxt, xmlDocumentPointer);

leave:

    if (parserCtxt) {
        xmlSchemaFreeParserCtxt(parserCtxt);
    }

    if (schema) {
        xmlSchemaFree(schema);
    }

    if (validCtxt) {
        xmlSchemaFreeValidCtxt(validCtxt);
    }
    printf("\n");
    printf("Validation successful: %s (result: %d)\n", (result == 0) ? "YES" : "NO", result);

    return 0;
}

控制台输出:

XSD File: /Users/dephiniteloop/Desktop/xml_validate/schema.xsd
XML File: /Users/dephiniteloop/Desktop/xml_validate/test.gkml

XML Source:

<?xml version="1.0" encoding="UTF-8"?>

<foo xmlns="http://example.com/XMLSchema/1.0">
</foo>

Validation Error: Element '{http://example.com/XMLSchema/1.0}foo': No matching global declaration available for the validation root.

Validation successful: NO (result: 1845)

如果重要的话:我使用的是 OSX 10.6.7,其默认为 libxml2.dylib
(/Developer/SDKs/MacOSX10.6.sdk/usr/lib/libxml2.2.7.3.dylib)

If I run this XML validation via xmllint:

xmllint --noout --schema schema.xsd test.xml

I get this success message:

.../test.xml validates

However if I run the same validation via libxml2's C API:

int result = xmlSchemaValidateDoc(...)

I get a return value of 1845 and this failure message:

Element '{http://example.com/XMLSchema/1.0}foo': No matching global declaration available for the validation root.

Which I can make absolutely no sense of. :(


schema.xsd:

<?xml version="1.0" encoding="utf-8" ?>
<!DOCTYPE xs:schema PUBLIC "-//W3C//DTD XMLSCHEMA 200102//EN" "XMLSchema.dtd" >
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns="http://example.com/XMLSchema/1.0" targetNamespace="http://example.com/XMLSchema/1.0" elementFormDefault="qualified" attributeFormDefault="unqualified">

    <xs:element name="foo">
    </xs:element>
</xs:schema>

test.xml:

<?xml version="1.0" encoding="UTF-8"?>

<foo xmlns="http://example.com/XMLSchema/1.0">
</foo>

main.c:

#include <stdio.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <string.h>

#include <libxml/parser.h>
#include <libxml/valid.h>
#include <libxml/xmlschemas.h>

u_int32_t get_file_size(const char *file_name) {
    struct stat buf;
    if ( stat(file_name, &buf) != 0 ) return(0);
    return (unsigned int)buf.st_size;
}

void handleValidationError(void *ctx, const char *format, ...) {
    char *errMsg;
    va_list args;
    va_start(args, format);
    vasprintf(&errMsg, format, args);
    va_end(args);
    fprintf(stderr, "Validation Error: %s", errMsg);
    free(errMsg);
}

int main (int argc, const char * argv[]) {
    const char *xsdPath = argv[1];
    const char *xmlPath = argv[2];

    printf("\n");

    printf("XSD File: %s\n", xsdPath);
    printf("XML File: %s\n", xmlPath);

    int xmlLength = get_file_size(xmlPath);
    char *xmlSource = (char *)malloc(sizeof(char) * xmlLength);

    FILE *p = fopen(xmlPath, "r");
    char c;
    unsigned int i = 0;
    while ((c = fgetc(p)) != EOF) {
        xmlSource[i++] = c;
    }
    printf("\n");

    printf("XML Source:\n\n%s\n", xmlSource);
    fclose(p);

    printf("\n");

    int result = 42;
    xmlSchemaParserCtxtPtr parserCtxt = NULL;
    xmlSchemaPtr schema = NULL;
    xmlSchemaValidCtxtPtr validCtxt = NULL;

    xmlDocPtr xmlDocumentPointer = xmlParseMemory(xmlSource, xmlLength);
    parserCtxt = xmlSchemaNewParserCtxt(xsdPath);

    if (parserCtxt == NULL) {
        fprintf(stderr, "Could not create XSD schema parsing context.\n");
        goto leave;
    }

    schema = xmlSchemaParse(parserCtxt);

    if (schema == NULL) {
        fprintf(stderr, "Could not parse XSD schema.\n");
        goto leave;
    }

    validCtxt = xmlSchemaNewValidCtxt(schema);

    if (!validCtxt) {
        fprintf(stderr, "Could not create XSD schema validation context.\n");
        goto leave;
    }

    xmlSetStructuredErrorFunc(NULL, NULL);
    xmlSetGenericErrorFunc(NULL, handleValidationError);
    xmlThrDefSetStructuredErrorFunc(NULL, NULL);
    xmlThrDefSetGenericErrorFunc(NULL, handleValidationError);

    result = xmlSchemaValidateDoc(validCtxt, xmlDocumentPointer);

leave:

    if (parserCtxt) {
        xmlSchemaFreeParserCtxt(parserCtxt);
    }

    if (schema) {
        xmlSchemaFree(schema);
    }

    if (validCtxt) {
        xmlSchemaFreeValidCtxt(validCtxt);
    }
    printf("\n");
    printf("Validation successful: %s (result: %d)\n", (result == 0) ? "YES" : "NO", result);

    return 0;
}

console output:

XSD File: /Users/dephiniteloop/Desktop/xml_validate/schema.xsd
XML File: /Users/dephiniteloop/Desktop/xml_validate/test.gkml

XML Source:

<?xml version="1.0" encoding="UTF-8"?>

<foo xmlns="http://example.com/XMLSchema/1.0">
</foo>

Validation Error: Element '{http://example.com/XMLSchema/1.0}foo': No matching global declaration available for the validation root.

Validation successful: NO (result: 1845)

In case it matters: I'm on OSX 10.6.7 with its default libxml2.dylib
(/Developer/SDKs/MacOSX10.6.sdk/usr/lib/libxml2.2.7.3.dylib)

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评论(3

[旋木] 2024-11-22 01:44:26

gnome项目的xml邮件列表上获得一些帮助后,我的错误似乎不是由我的错误引起的,而是而是由OSX 10.6.x 的 libxml2 发行版 (v2.7.3)
(如:相同的代码适用于其他人,但对我来说 OSX 的旧版发行版失败)

我检查了 libxml2 发行说明并发现了两个候选者:

更新 2.7.4 的发行说明列出了以下错误修复:

  • “579746 XSD 验证不正确/ nilable groups (Daniel Veillard)”

更新 2.7.8 的发行说明列出了以下错误修复:

  • “修复 XSD 双重验证检查中的错误 (Csaba Raduly)”

尚未成功不过,让 libxml2 的最新版本(v2.7.8)与我的项目(或者更确切地说是 Xcode)一起使用。

After getting some help on the gnome project's xml mailing-list it appears as if my error is not caused by a bug of mine, but rather by a bug of OSX 10.6.x's distribution (v2.7.3) of libxml2.
(as in: same code works for others, yet fails for me OSX' legacy distribution)

I checked the libxml2 release notes and found two candidates:

Release notes of Update 2.7.4 list the following bug fix:

  • "579746 XSD validation not correct / nilable groups (Daniel Veillard)"

Release notes of Update 2.7.8 list the following bug fix:

  • "Fix errors in XSD double validation check (Csaba Raduly)"

Haven't yet had success getting the latest build (v2.7.8) of libxml2 to work with my project (or rather Xcode in general) though.

腹黑女流氓 2024-11-22 01:44:26

我在 Ubuntu Linux 上尝试了你的内容和代码。工作没有任何异议。

构建命令:

gcc -Wall -I/usr/include/libxml2 main.c -lxml2 -o xmlvalid 

运行命令:

./xmlvalid ./schema.xsd ./test.xml

输出:

XSD File: ./schema.xsd
XML File: ./test.xml

XML 源:

<?xml version="1.0" encoding="UTF-8"?>

<foo xmlns="http://example.com/XMLSchema/1.0">
</foo>

验证成功:是(结果:0)

I tried your content and code on Ubuntu Linux. Worked without any objection.

Build command:

gcc -Wall -I/usr/include/libxml2 main.c -lxml2 -o xmlvalid 

Run command:

./xmlvalid ./schema.xsd ./test.xml

Output:

XSD File: ./schema.xsd
XML File: ./test.xml

XML Source:

<?xml version="1.0" encoding="UTF-8"?>

<foo xmlns="http://example.com/XMLSchema/1.0">
</foo>

Validation successful: YES (result: 0)

策马西风 2024-11-22 01:44:26

您的架构将元素 foo 放入 targetNamespace 中(这就是 elementdefault="qualified" 的含义),但您的实例文档没有声明该名称空间或任何其他名称空间。所以 foo 实际上并不匹配。

Your schema puts the element foo into the targetNamespace (that's what elementdefault="qualified" means), but your instance document doesn't declare that namespace or any other. So the foos don't actually match.

~没有更多了~
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