» XPath (XML)
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XPath (XML)

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

Here you are supposed to see an image (rendered with SVG) describing the pins of this node. However, this does not work with Internet Explorer. You may want to consider using another browser, like FireFox, Chrome, Safari or Opera that do support SVG.

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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)

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Shoutbox

~2d ago

ggml: little enttec dmx help on a saturday night ?

~5d ago

joreg: Interested in #visualprogramming with #vvvv? Meetup in #berlin on the 25th: 10-berlin-vvvv-meetup Featuring @kopffarben

~6d ago

ggml: is pepperoni dmx adapter still expected to work with b38 ?

~6d ago

bo27: @sinus hi! Thanks for using the template. Run is for endusers and it kills explorer. Try developer.bat to access patches

~6d ago

sinus: @bo24: sorry for da hassle. everything´s fine again. several restarts did the job.

~6d ago

sinus: @bo24: my mail db@servus.at

~6d ago

sinus: @IvanRastr aka bo24: found your project template, tested run bat.file, now my screen is black. only cursor. what to do?

~11d ago

cznickesz: @tonfilm thanks for the info. Can´t wait to give it a try!

~12d ago

tonfilm: @cznickesz #vvvv #vl #xenko integration is not ready for the public yet, it's still under heavy development... more updates soon.