如何选择xlink:href属性不含'specyfic'的元素

Got it, let's walk through how to count those SVG <image> elements where the xlink:href attribute doesn't contain the string 'specyfic' — whether there are zero, one, or multiple matches. Here are a few practical approaches depending on your use case:

1. Browser-side JavaScript (for frontend scenarios) #

If you're working with an SVG embedded in a web page, use the DOM API to filter and count the elements:

// Grab all <image> elements in the SVG
const allImageElements = document.querySelectorAll('image');

// Filter to keep only those without 'specyfic' in their xlink:href
const matchingElements = Array.from(allImageElements).filter(img => {
  const hrefValue = img.getAttribute('xlink:href');
  // Include elements that don't have the xlink:href attribute at all
  return !hrefValue || !hrefValue.includes('specyfic');
});

// Get the final count
const totalCount = matchingElements.length;
console.log(`Number of non-specific elements: ${totalCount}`);

This handles edge cases like images that don't have an xlink:href attribute at all (they'll be counted as valid, since they don't contain the target string).

2. XPath (for XML/SVG document processing) #

XPath is great if you're using tools that support it (like browser dev tools, Python's lxml library, or XML editors). Use this expression to directly get the count:

count(//image[not(contains(@xlink:href, 'specyfic'))])

For example, in your browser's console, you can run:

const count = document.evaluate(
  "count(//image[not(contains(@xlink:href, 'specyfic'))])",
  document,
  null,
  XPathResult.NUMBER_TYPE,
  null
).numberValue;
console.log(count);

The XPath automatically includes elements without the xlink:href attribute, since contains(null, 'specyfic') returns false, and not(false) evaluates to true.

3. Command-line tool (xmllint, for batch file processing) #

If you need to process local SVG files from the command line, use xmllint (common on Linux/macOS, or available via tools like Git Bash on Windows):

xmllint --xpath "count(//image[not(contains(@xlink:href, 'specyfic'))])" your-svg-file.svg

Running this will print the exact count of matching elements directly to your terminal.

Important note: Double-check the spelling — you wrote 'specyfic' (not the more common 'specific') so make sure all your expressions use that exact string to avoid mismatches.

内容的提问来源于stack exchange，提问作者Jerzy Gruszka