» 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

~21h ago

io: @sinao build the cube in a 3d editor soft such as Blender and do the UV mapping there

~1d ago

sinao: one side

~1d ago

sinao: How to apply texture only on one of a cube?

~2d ago

tonfilm: Just updated the CraftLie rendering pack to latest: craftlie-dx11-drawing-for-vl

~6d ago

microdee: 2 seconds later: I asked before googling, but why do you need OS support for texture compression?

~6d ago

microdee: what's BC7?

~6d ago

antokhio: https://aka.ms/AA65g28 upvote pls for bc7 support in windows