My XML:
<root>
<cars>
<makes>
<honda year="1995">
<model />
<!-- ... -->
</honda>
<honda year="2000">
<!-- ... -->
</honda>
</makes>
</cars>
</root>
I need a XPath that will get me all models for <honda> with year 1995.
so:
/root/cars/makes/honda
But how to reference an attribute?
"I need a XPath that will get me all models for <honda> with year 1995."
That would be:
/root/cars/makes/honda[#year = '1995']/model
Try /root/cars/makes/honda/#year
UPDATE: reading your question again:
/root/cars/makes/honda[#year = '1995']
Bottom line is: use # character to reference xml attributes.
Related
How can I insert another XML element into an XML file I'm creating with Builder::XmlMarkup? e.g., something like
xml = Builder::XmlMarkup.new( :indent => 4 )
xml.content
xml.common do
xml.common_field1 do
// common_field1 content
end
xml.common_field2 do
// common_field 2 content
end
end
xml.custom do
xml.insert!(<XML element>)
end
end
Where <XML element> looks something like
<elements>
<element>
// element content
</element>
<element>
// element content
</element>
<elements>
and the final output looks like
<content>
<common>
<content1>
<!-- content1 -->
</content1>
<content2>
<!-- content2 -->
</content2>
</common>
<custom>
<elements>
<element>
<!-- element content -->
</element>
<element>
<!-- element content -->
</element>
</elements>
</custom>
</content>
I've tried using the << operator but that doesn't unfortunately doesn't maintain formatting.
<< is exactly what you need:
xml.custom do |custom|
custom << '<XML element>'
end
Rubydocs doesn't seem to work, so here's the link to the source code: https://github.com/jimweirich/builder/blob/master/lib/builder/xmlbase.rb#L104
I have XML that has a lot of duplicated values. I'd like to select all the rows with a specific section ("sec") and section tag ("sec_tag"), but I can't seem to get the XPath correct.
Here's a small snippet of the XML:
<root>
<record>
<sec>5</sec>
<sec_tag>919</sec_tag>
<nested_tag>
<info>Info</info>
<types>
<type>1</type>
<type>2</type>
<type>3</type>
</types>
</nested_tag>
<flags>00000000</flags>
</record>
<record>
<sec>5</sec>
<sec_tag>930</sec_tag>
<nested_tag>
<info>Info</info>
<types>
<type>1</type>
<type>2</type>
<type>3</type>
</types>
</nested_tag>
<flags>00000000</flags>
</record>
<record>
<sec>7</sec>
<sec_tag>919</sec_tag>
<nested_tag>
<info>Info</info>
<types>
<type>1</type>
<type>2</type>
<type>3</type>
</types>
</nested_tag>
<flags>00000000</flags>
</record>
</root>
I want the node that has <sec>5</sec> and <sec_tag>919</sec_tag>.
I tried something like this:
//sec[text(), "5"] and //sec_tag[text(), "919"]
Obviously that's not the correct syntax there, I just need to find the correct XPath expression.
You can use the following XPath expression to return record elements having child sec equals 5 and sec_tag equals 919 :
//record[sec = 5 and sec_tag = 919]
<School>
<Child_One>
<Subject>
<name>computers</name>
<marks>55</marks>
<name>mathematics</name>
<marks>44</marks>
</Subject>
<Child_One>
<Child_Two>
<name>computers</name>
<marks>66</marks>
<name>mathematics</name>
<marks>77</marks>
</Child_Two>
</School>
Can anybody help me to find the Child_One subject name, in which he got highest marks
Thanks
First of all a few formatting things:
Your XML is not quite well formatted. It should have the same start and end tags
I believe the Subject element should look different then posted
When posting a input XML, don't use backticks, but indent the XML with 4 spaces to format it well on Stackoverflow
I used and changed the input XML to this:
<?xml version="1.0" encoding="UTF-8"?>
<School>
<Child_One>
<Subject>
<name>computers</name>
<marks>55</marks>
</Subject>
<Subject>
<name>mathematics</name>
<marks>44</marks>
</Subject>
</Child_One>
<Child_Two>
<Subject>
<name>computers</name>
<marks>66</marks>
</Subject>
<Subject>
<name>mathematics</name>
<marks>77</marks>
</Subject>
</Child_Two>
</School>
With XPath 2.0 you can use the following the find the max value:
/School/Child_One/Subject[marks = max(/School/Child_One/Subject/marks)]/name
With XPath 1.0 you can use the following (replace < with > to find minimum):
/School/Child_One/Subject[not(marks < /School/Child_One/Subject/marks)][1]/name
I am trying to parse XML files using Nokogiri, Ruby and XPath. I usually don't encounter any problem but with the following I can't make any xpath request:
doc = Nokogiri::HTML(open("myfile.xml"))
doc.("//Meta").count
# result ==> 0
doc.xpath("//Meta")
# result ==> []
doc.xpath(.).count
# result => 1
Here is an simplified version of my XML File
<Answer xmlns="test:com.test.search" context="hf%3D10%26target%3Dst0" last="0" estimated="false" nmatches="1" nslices="0" nhits="1" start="0">
<time>
...
</time>
<promoted>
...
</promoted>
<hits>
<Hit url="http://www.test.com/" source="test" collapsed="false" preferred="false" score="1254772" sort="0" mask="272" contentFp="4294967295" did="1287" slice="1">
<groups>
...
</groups>
<metas>
<Meta name="enligne">
<MetaString name="value">
</MetaString>
</Meta>
<Meta name="language">
<MetaString name="value">
fr
</MetaString>
</Meta>
<Meta name="text">
<MetaText name="value">
<TextSeg highlighted="false" highlightClass="0">
La
</TextSeg>
</MetaText>
</Meta>
</metas>
</Hit>
</hits>
<keywords>
...
</keywords>
<groups>
...
</groups>
How can I get all children of <Hit> from this XML?
Include the namespace information when calling xpath:
doc.xpath("//x:Meta", "x" => "test:com.test.search")
You can use the remove_namespaces! method and save your day.
This is one of the most FAQ XPAth questions -- search for "XPath default namespace".
If there is no way to register a namespace for the default namespace and use the registered prefix (say "x" in //x:Meta) then use:
//*[name() = 'Meta` and namespace-uri()='test:com.test.search']
If it is known that Meta can only belong to the default namespace, then the above can be shortened to:
//*[name() = 'Meta`]
I'm pulling the following XML from mediawiki API
<?xml version="1.0"?>
<api>
<query>
<pages>
<page pageid="309311" ns="0" title="Chenonetta jubata">
<images>
<im ns="6" title="File:Australian Wood Duck.jpg" />
<im ns="6" title="File:Australian Wood Duck Female.JPG" />
<im ns="6" title="File:Australian Wood Duck Male.JPG" />
...
</images>
</page>
</pages>
</query>
</api>
and reading it into a Ruby map using xmlSimple. The data which I'm really trying to get is the image names from the images section but when I attempt to go past the query level with
x= result['query']['pages']
puts x
I'm getting the following error:
in `[]': can't convert String into Integer (TypeError)
what am I doing wrong?
Thanks,
m
I used Nokogiri in the end which allows xpath notation to traverse the xml tree.
e.g.
licenseinfo = results3.xpath("//api/query/pages/page/categories/cl/#title")