如何设置xmllint的目录文件?

问题描述

好的.我想为xmllint设置目录文件以解决问题，以便从本地文档验证dcterms xml命名空间.我相信我做对了所有事情，但是似乎根本行不通.

Ok. I want to set up catalog files for xmllint to fix things so that the dcterms xml namespace is validated from a local document. I believe that I have done everything right, but it simply doesn't seem to be working.

我正在运行OSX.

我已经创建了目录/etc/xml

I have created a directory /etc/xml

$ mkdir /etc/xml
$ cd /etc/xml

我已将dcterms.xsd下载到该目录

I have downloaded dcterms.xsd to that directory

$ ls -l
-rw-r--r--  1 ibis  wheel  12507 24 Jul 11:42 dcterms.xsd

我创建了一个名为"catalog"的文件

I have created a file named "catalog"

$ xmlcatalog --create > catalog

我已将dcterms命名空间添加到目录文件中

I have added the dcterms namespace to the catalog file

$ xmlcatalog --noout --add uri http://purl.org/dc/elements/1.1/ file:///etc/xml/dc.xsd
$ xmlcatalog --noout --add uri http://purl.org/dc/terms/ file:///etc/xml/dcterms.xsd
$ cat catalog
<?xml version="1.0"?>
<!DOCTYPE catalog PUBLIC "-//OASIS//DTD Entity Resolution XML Catalog V1.0//EN" "http://www.oasis-open.org/committees/entity/release/1.0/catalog.dtd">
<catalog xmlns="urn:oasis:names:tc:entity:xmlns:xml:catalog">
  <uri name="http://purl.org/dc/elements/1.1/" uri="file:///etc/xml/dc.xsd"/>
  <uri name="http://purl.org/dc/terms/" uri="file:///etc/xml/dcterms.xsd"/>
</catalog>

在工作目录中，我创建了一个简单的xml模式，名为Empty.xsd

In a work directory, I have created a simple xml schema named Empty.xsd

<?xml version="1.0" encoding="UTF-8"?>
<schema xmlns="http://www.w3.org/2001/XMLSchema" targetNamespace="http://www.example.org/Empty" xmlns:tns="http://www.example.org/Empty" elementFormDefault="qualified">
  <element name="empty">
    <complexType>
      <sequence>
        <any processContents="strict" minOccurs="0" maxOccurs="unbounded"/>
      </sequence>
      <anyAttribute></anyAttribute>
    </complexType>
  </element>
</schema>

请注意，过程内容是严格的".

Note that the processcontnts is "strict".

我已经创建了一个XML文件，该文件应该触发所有验证:

I have created an XML file which should trigger all the validation:

<?xml version="1.0" encoding="UTF-8"?>
<empty xmlns="http://www.example.org/Empty" 
          xmlns:dcterms="http://purl.org/dc/terms/">
    <dcterms:title>A title</dcterms:title>
</empty>

然后我尝试对其进行验证.

Then I attempt to validate it.

$ xmllint --noout --valid --schema Empty.xsd Empty.xml
Empty.xml:2: validity error : Validation failed: no DTD found !
y xmlns="http://www.example.org/Empty" xmlns:dcterms="http://purl.org/dc/terms/"
                                                                               ^
Empty.xml:3: element title: Schemas validity error : Element '{http://purl.org/dc/terms/}title': No matching global element declaration available, but demanded by the strict wildcard.
Empty.xml fails to validate

我已经按照文档中的指定建立了目录，并将其指向本地dcterms模式文件.为什么xmllint找不到它?

I have set up a catalog as specified in the docs and pointed it at the local dcterms schema file. Why does xmllint fail to find it?

推荐答案

1. 我在dcterms中没有title元素，因此我将其替换为abstract
2. 我找不到任何确认，但是其他人也报告了在libxml中将目录文件用于xsd模式的问题.我发现目录对于dtds来说还可以.
3. 有一种解决方法.将<import namespace="http://purl.org/dc/terms/" schemaLocation="dcterms.xsd" />插入Empty.xsd.之后，我摆脱了No matching global消息.
4. No DTD found仍然可见，但是返回码从3增加到4，这意味着可以成功解析.
5. --sax开关似乎有助于未找到DTD"消息.

1. I don't have title element in the dcterms, so I replaced it with abstract
2. I can't find any confirmation, but other people also report problems with using catalog files for xsd schemas in libxml. I found catalogs working ok for dtds though.
3. There is a workaround. Insert <import namespace="http://purl.org/dc/terms/" schemaLocation="dcterms.xsd" /> into Empty.xsd. After that I got rid of No matching global message.
4. No DTD found is still visible, but the return code increased from 3 to 4 and that means kind of successful parse.
5. --sax switch seems to help for "No DTD found" message.

相关问题:具有架构标头和目录查找的Xml验证，没有答案.大约是第2点.

Related question: Xml validation with schema header and Catalog lookup, no answer. That's about point 2.

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