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POHow to parse xml string having deep structures using python
 

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  1. POHow to parse xml string having deep structures using python
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    <p>A similar question is asked here (<a href="https://stackoverflow.com/questions/7939954/python-xml-parsing">Python XML Parsing</a>) but I could not reach to the content I am interested in. </p> <p>I need to extract all the information that is enclosed between the tag <code>patent-classification</code> if the <code>classification-scheme</code> tag value is <code>CPC</code>. There are multiple such element and are enclosed inside <code>patent-classifications</code> tag. </p> <p>In the example given below, there are three such values: <code>C 07 K 16 22 I</code> , <code>A 61 K 2039 505 A</code> and <code>C 07 K 2317 21 A</code> </p> <pre><code>&lt;?xml version="1.0" encoding="UTF-8"?&gt;&lt;?xml-stylesheet type="text/xsl" href="/3.0/style/exchange.xsl"?&gt; &lt;ops:world-patent-data xmlns="http://www.epo.org/exchange" xmlns:ops="http://ops.epo.org" xmlns:xlink="http://www.w3.org/1999/xlink"&gt; &lt;ops:meta name="elapsed-time" value="21"/&gt; &lt;exchange-documents&gt; &lt;exchange-document system="ops.epo.org" family-id="39103486" country="US" doc-number="2009234106" kind="A1"&gt; &lt;bibliographic-data&gt; &lt;publication-reference&gt; &lt;document-id document-id-type="docdb"&gt; &lt;country&gt;US&lt;/country&gt; &lt;doc-number&gt;2009234106&lt;/doc-number&gt; &lt;kind&gt;A1&lt;/kind&gt; &lt;date&gt;20090917&lt;/date&gt; &lt;/document-id&gt; &lt;document-id document-id-type="epodoc"&gt; &lt;doc-number&gt;US2009234106&lt;/doc-number&gt; &lt;date&gt;20090917&lt;/date&gt; &lt;/document-id&gt; &lt;/publication-reference&gt; &lt;classifications-ipcr&gt; &lt;classification-ipcr sequence="1"&gt; &lt;text&gt;C07K 16/ 44 A I &lt;/text&gt; &lt;/classification-ipcr&gt; &lt;/classifications-ipcr&gt; &lt;patent-classifications&gt; &lt;patent-classification sequence="1"&gt; &lt;classification-scheme office="" scheme="CPC"/&gt; &lt;section&gt;C&lt;/section&gt; &lt;class&gt;07&lt;/class&gt; &lt;subclass&gt;K&lt;/subclass&gt; &lt;main-group&gt;16&lt;/main-group&gt; &lt;subgroup&gt;22&lt;/subgroup&gt; &lt;classification-value&gt;I&lt;/classification-value&gt; &lt;/patent-classification&gt; &lt;patent-classification sequence="2"&gt; &lt;classification-scheme office="" scheme="CPC"/&gt; &lt;section&gt;A&lt;/section&gt; &lt;class&gt;61&lt;/class&gt; &lt;subclass&gt;K&lt;/subclass&gt; &lt;main-group&gt;2039&lt;/main-group&gt; &lt;subgroup&gt;505&lt;/subgroup&gt; &lt;classification-value&gt;A&lt;/classification-value&gt; &lt;/patent-classification&gt; &lt;patent-classification sequence="7"&gt; &lt;classification-scheme office="" scheme="CPC"/&gt; &lt;section&gt;C&lt;/section&gt; &lt;class&gt;07&lt;/class&gt; &lt;subclass&gt;K&lt;/subclass&gt; &lt;main-group&gt;2317&lt;/main-group&gt; &lt;subgroup&gt;92&lt;/subgroup&gt; &lt;classification-value&gt;A&lt;/classification-value&gt; &lt;/patent-classification&gt; &lt;patent-classification sequence="1"&gt; &lt;classification-scheme office="US" scheme="UC"/&gt; &lt;classification-symbol&gt;530/387.9&lt;/classification-symbol&gt; &lt;/patent-classification&gt; &lt;/patent-classifications&gt; &lt;/bibliographic-data&gt; &lt;/exchange-document&gt; &lt;/exchange-documents&gt; &lt;/ops:world-patent-data&gt; </code></pre>
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