» 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

~11d ago

fleg: This Tuesday, Cologne: exhibition opening of "interwoven", textile disinformation patterns created with vvvv. https://fleg.de/news/exhibition-interwoven

~25d ago

manuelgonzalvez: Assimp nodes all broken afted Win Update w/exception "COM object that has been separated from its underlying RCW(...)"

~25d ago

manuelgonzalvez: @levi thanks would love to! anyway managed to get something similar working based on forum search and anthokio's patches.

~25d ago

levi: @ravasquez thanks. 31.2 x86 verrion worked. @manuelgonzalvez i have a dx11 projectTexture if u a want.

~26d ago

manuelgonzalvez: Anyone has a dx11 port of "projectedTexture" dx9 fx for projection mapping?

~26d ago

manuelgonzalvez: Anyone has a dx11 port of "projectedTexture" dx9 fx for projection mapping?

~27d ago

ravazquez: @levi not sure bout the ImagePack, but I believe VL.OpenCV should give you the same tools and should work with beta just fine

~27d ago

levi: anyone knows of a VVVVpacks.image that works for elliot's projector calibration patches?x64,dx11. always crashes v4 on solve.

~1mth ago

Lorenz: VJing with GIFS: https://lorenzpotthast.de/gifjockey/ A fun little side project, that I first prototyped in v4 and now turned web-based ;)

~2mth ago

schlonzo: finally fixed in 4.8 nice1