simple.graphml

<?xml version="1.0" encoding="UTF-8"?>
<graphml xmlns="http://graphml.graphdrawing.org/xmlns"  
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://graphml.graphdrawing.org/xmlns
     http://graphml.graphdrawing.org/xmlns/1.0/graphml.xsd">
  <graph id="G" edgedefault="undirected">
    <node id="n0"/>
    <node id="n1"/>
    <node id="n2"/>
    <node id="n3"/>
    <node id="n4"/>
    <node id="n5"/>
    <node id="n6"/>
    <node id="n7"/>
    <node id="n8"/>
    <node id="n9"/>
    <node id="n10"/>
    <edge source="n0" target="n2"/>
    <edge source="n1" target="n2"/>
    <edge source="n2" target="n3"/>
    <edge source="n3" target="n5"/>
    <edge source="n3" target="n4"/>
    <edge source="n4" target="n6"/>
    <edge source="n6" target="n5"/>
    <edge source="n5" target="n7"/>
    <edge source="n6" target="n8"/>
    <edge source="n8" target="n7"/>
    <edge source="n8" target="n9"/>
    <edge source="n8" target="n10"/>
  </graph>
</graphml>

SimpleParse.go

package main

import (
    "fmt"
    "os"
    "log"
    "io/ioutil"
    "encoding/xml"
)

type GraphML struct {
    XMLName      xml.Name `xml:"graphml"`       // Graph Name
    Xml          string   `xml:",innerxml"`     // Raw XML
    Graph        Graph    `xml:"graph"`         // element
}

type Graph struct {
    Id           string   `xml:"id,attr"`           // attribute
    EdgeDefault  string   `xml:"edgedefault,attr"`  // attribute
    Nodes        []Node   `xml:"node"`              // elements
    Edges        []Edge   `xml:"edge"`              // elements
}

type Node struct {
    Id           string   `xml:"id,attr"`       // attribute
}

type Edge struct {
    Source       string   `xml:"source,attr"`   // attribute
    Target       string   `xml:"target,attr"`   // attribute
}

func main() {

    // Open and Read File
    xmlFile, err := os.Open("./simple.graphml")
    if err != nil {
        log.Fatal(err)
        return
    }
    defer xmlFile.Close()

    xmlData, err := ioutil.ReadAll(xmlFile)
    if err != nil {
        log.Fatal(err)
        return
    }

    // Unmarshal
    var graphml GraphML
    xml.Unmarshal(xmlData, &graphml)


    // Print
    fmt.Println(graphml.XMLName)

    for _, node := range graphml.Graph.Nodes {
        fmt.Printf("Node: %s\n", node.Id)
    }

    for _, edge := range graphml.Graph.Edges {
        fmt.Printf("Edge: %s <=> %s\n", edge.Source, edge.Target)
    }
}