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I am trying to parse a xhtml file in ios using touchXML. I am trying it for first time. I have following format in XHTML:

<?xml version="1.0" encoding="UTF-8"?>
<html xmlns="http://www.w3.org/1999/xhtml" xmlns:epub="http://www.idpf.org/2007/ops" lang="en">
  <head>
    <meta http-equiv="default-style" content="text/html; charset=utf-8"/>
    <title>Contents</title>
    <link rel="stylesheet" href="css/igp-widget-world.css" type="text/css"/>
  </head>
  <body>

    <nav epub:type="toc"><h2>Contents</h2>
      <ol epub:type="list">
        <li><a href="s001-BookTitlePage-01.xhtml">Widget World</a></li>
        <li><a href="s002-Copyright-01.xhtml">Copyright</a></li>
        <li><a href="s003-TableOfContents-01.xhtml">Contents</a></li>
        <li><a href="s004-Introduction-01.xhtml">Introduction</a></li>
        <li><a href="s005-Part-001.xhtml">PART 1: EVENTS AND COMMANDS</a></li>
        <li><a href="s006-Topic-001.xhtml">1: Timeline Events</a></li>
        <li><a href="s007-Topic-002.xhtml">2: Counter Events</a></li>
        <li><a href="s008-Topic-003.xhtml">3: Sprite Events</a></li>
        <li><a href="s009-Part-002.xhtml">PART 2: QUESTIONS AND ANSWERS</a></li>
        <li><a href="s010-Topic-004.xhtml">4: QAA True-False</a></li>
        <li><a href="s011-Topic-005.xhtml">5: QAA True-False Multi</a></li>
        <li><a href="s012-Topic-006.xhtml">6: QAA-Multichoice</a></li>
        <li><a href="s013-Topic-007.xhtml">7: QAA Multi-Response</a></li>
        <li><a href="s014-Topic-008.xhtml">8: QAA Association</a></li>
        <li><a href="s015-Topic-009.xhtml">9: QAA Sequence</a></li>
        <li><a href="s016-Topic-010.xhtml">10: QAA-Textmatch</a></li>
        <li><a href="s017-Topic-011.xhtml">11: QAA-Textmatch Multi</a></li>
        <li><a href="s018-Topic-012.xhtml">12: QAA Sort Word</a></li>
        <li><a href="s019-Topic-013.xhtml">13: QAA Set</a></li>
        <li><a href="s020-Part-003.xhtml">PART 3: INTERACTIVE WIDGETS</a></li>
        <li><a href="s021-Topic-014.xhtml">14: Widgets: Horizontal Sliding Panel</a></li>
        <li><a href="s022-Topic-015.xhtml">15: Widgets: Vertical Sliding Panel</a></li>
        <li><a href="s023-Topic-016.xhtml">16: Widgets: Horizontal Tutorial Panel</a></li>
        <li><a href="s024-Topic-017.xhtml">17: Widgets: Vertical Tutorial Panel</a></li>
        <li><a href="s025-Topic-018.xhtml">18: Widgets: Vertical Scrolling Panel</a></li>
        <li><a href="s026-Topic-019.xhtml">19: Widgets: Horizontal Scrolling Panel</a></li>
        <li><a href="s027-Topic-020.xhtml">20: Widgets: XY Scrolling Panel</a></li>
        <li><a href="s028-Topic-021.xhtml">21: Widgets: Locked Panel</a></li>
        <li><a href="s029-Topic-022.xhtml">22: Widgets: Popups</a></li>
        <li><a href="s030-Topic-023.xhtml">23: Widgets: Reveal</a></li>
        <li><a href="s031-Topic-024.xhtml">24: Widgets: PopUp Panel</a></li>
        <li><a href="s032-Colophon-01.xhtml">Colophon</a></li>
      </ol>
    </nav>
  </body>
</html>

This is my xhtml file. I implemented as follow:

CXMLDocument* xmlDoc = [[CXMLDocument alloc] initWithContentsOfURL:myURL options:0 error:nil];
NSString* xpath = [NSString stringWithFormat:@"//html:a[contains(@href,'%@')]/../html:a", myValue];
NSArray* navPoints = [ncxToc nodesForXPath:xpath namespaceMappings:[NSDictionary dictionaryWithObject:@"http://www.w3.org/1999/xhtml/" forKey:@"xhtml"] error:nil];

I am trying to find value of <a> where <a href = my value.

I am not sure where I am wrong the error is:

XPath error : Undefined namespace prefix
XPath error : Invalid expression

Than I changed the xpath as follow:

NSString* xpath = [NSString stringWithFormat:@"//html/a[contains(@href,'%@')]/../html/a", myValue];

: replaced by /. It is not giving me error as above but not getting my content either.

I don't know about XPATH. In XML I only know about NSXMLParser. Please help me to identify what's wrong in this?

Update

As the answers I got till now I updated my code and did as follow:

NSString* xpath = [NSString stringWithFormat:@"//html:a[@href = '%@']", href];
NSArray* navPoints = [ncxToc nodesForXPath:xpath namespaceMappings:[NSDictionary dictionaryWithObject:@"http://www.w3.org/1999/xhtml/" forKey:@"html"] error:nil];

and

NSString* xpath = [NSString stringWithFormat:@"//xhtml:a[@href = '%@']", href];
NSArray* navPoints = [ncxToc nodesForXPath:xpath namespaceMappings:[NSDictionary dictionaryWithObject:@"http://www.w3.org/1999/xhtml/" forKey:@"xhtml"] error:nil];

There is no error but I getting any object in the array. I don't think my XPath is working.

Update 2

The Xpath I am getting is as follow:

//xhtml:a[@href = 's001-BookTitlePage-01.xhtml'] 
or
//html:a[@href = 's001-BookTitlePage-01.xhtml']

also when I tried a xpath like: //html:a even though I am not getting all anchor tags.

** UPDATE 3**

I tried to check the XPath online http://www.xpathtester.com/test

I found following error on my XPath //html:a

Exception occurred evaluting XPath: //html:a. Exception: XPath expression uses unbound namespace prefix html

Don't know what it means.

Thanks

4

2 回答 2

0

//a[@href="s001-Cover-01.xhtml"]/text()
返回 '​​Cover' 但您的文档格式错误：<body>未关闭

于 2013-06-20T06:40:36.390 回答
0

您将命名空间注册为“xhtml”，但在查询中使用前缀“html”。

注册命名空间的代码：

NSArray* navPoints = [ncxToc nodesForXPath:xpath namespaceMappings:[NSDictionary dictionaryWithObject:@"http://www.w3.org/1999/xhtml/" forKey:@"xhtml"] error:nil];

您的 XPath 查询：

//html:a[contains(@href,'%@')]/../html:a

更改两行之一以适合前缀：

//xhtml:a[contains(@href,'%@')]/../xhtml:a

无论如何，您可能应该去掉最后两个返回列表项并再次查找锚元素的轴步骤。@href如果列表项中有两个锚元素（直接），尽管只有一个与属性匹配，但您会同时获得它们。此外，您写道您想比较它们是否相等，因此不需要contain()它们是否真的相等：

//xhtml:a[@href = '%@']
于 2013-06-21T08:29:57.547 回答