» 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)

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Shoutbox

~5d ago

andresc4: gamma+stride+fuse+standaloneapp+soputoutput+oscinput = lovvvvvveeeeeee!!!!

~7d ago

joreg: @pechart thanks for the flowers!

~8d ago

pechart: Just a big shoutout to the whole vvvv devteam and the friendly community! It's fantastic to export patches to standalone apps. THX!

~17d ago

daviddenker: We are looking asap for 3x Azure Kinect to rent or buy. Any kind of help appreciated! :-)

~19d ago

mediadog: Hmmm md.ecosystem link on staff pics page is not found

~21d ago

schlonzo: physics constraints and forces plz?

~23d ago

karistouf: thank you @gml but im thinking about and old version of vvvvv. There was a redraw with HSL of each pixels

~24d ago

schlonzo: no more previews? is there a 4.0 stable?

~25d ago

sunep: Live now. I perform live AV with Thomas Li after kiloton who is performing now. https://youtu.be/IG5oC6JvMeM

~25d ago

ggml: @karistouf ColorAndDepth help file