» 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

~7d ago

Joanie_AntiVJ: I have an issue with some reflection calculations, any vector expert may know the secret of mirrors ? :) https://discourse.vvvv.org/t/help-to-mirror-a-vector/20523/4

~7d ago

Joanie_AntiVJ: I have an issue with some reflection calculations, any vector expert may know the secret of mirrors ? :) https://discourse.vvvv.org/t/help-to-mirror-a-vector/20523/4

~17d ago

joreg: @LCA remember that we also provide custom support for commercial projects: https://visualprogramming.net/#Support

~18d ago

LCA: where to ask about hardware setups: VL application over 26 1080p displays. maybe also with FUSE

~25d ago

tonfilm: @tobyk there is also this, who wants to win: https://bottosson.github.io/posts/oklab/

~1mth ago

tobyk: LCH is the best color space, all the other color spaces are now big losers. https://atmos.style/blog/lch-color-space

~1mth ago

schlonzo: "HowTo Work with Children" somehow I expected something else :D

~2mth ago

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