» XPath (XML)
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XPath (XML)

Help Returns a Spread of matches to XPath Queries
Author vvvv group

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about XPath (XML)

Returns a Spread of matches from an XPath-Query.
XPath is a W3C Recommendation and describes a way how to navigate through XML Documents.
We can use XPath to select values of elements from a XML File. Every XPath Expression must start with "/". An XPath expression works like navigating a file system; where a forward slash (/) selects subdirectories.
Inside of [ ] Brackets you can specify you your Query. Then you keep on defining the Path with "/". The "@" means that you select an attribute.

There are a lot of functions and operators you can use. We cant give a complete instruction to XPath. But try the Microsoft Reference Online.
A good site to learn everything about the X-Stuff ishttp://www.w3schools.com
A good reference of XPath Syntax and Fuctions is http://msdn.microsoft.com/en-us/library/ms256115.aspx

Examples

if you ever had a look at a .v4p file using a texteditor you will see that those are also pure XML.
so the following examples will be based on vvvv's own files.

parsing a .v4p file with this query

/PATCH/NODE/PIN[@pinname='Descriptive Name']/@values

will output a spread containing all Descriptive Names used in the patch.

/PATCH/NODE[@id='7']/@nodename

will output the nodename of the node with the id ="7"

so this way you can navigate in XML with paths similar to the folderstructures of your harddisk.

you can do more advanced queries like:

/PATCH/NODE[(@nodename='IOBox (Value Advanced)')and(not(PIN[contains(@pinname,'Descriptive Name')]))]/@id

which will output a spread containg all id's of IOBox Values which do NOT have a Descriptive Name.

hints

See also XSLT (XML)

anonymous user login

Shoutbox

~1d ago

antokhio: @luper vc redist 2013

~4d ago

guest: @Luper, you'll probably need to make the PhongDirectional etc node have one of the pins → NoTexture, and then voilà!

~5d ago

Luper: hey guy, just reinstalled VVVV and text(DX11.Geometry) not working, any idea why?

~6d ago

joreg: Reminder: Show us what you're patching on: #vvvv meetup tomorrow, Tue, Feb 23, 8pm CET: 8.-worldwide-meetup

~9d ago

vux: Hey all, we now in Berlin with @idwyr, say if you want to catch up :)

~13d ago

joreg: @mediadog got it thanks!